A staff member of the EU must share confidential documents with a colleague in an EU delegation abroad using digital tools. According to the guidelines of the Service Europeen d’Action Extérieure (SEAE) and the EU’s principles of digital security, which is the safest practice to ensure the protection of these sensitive data during transmission? option_A: Send the documents through a personal instant messaging app (like WhatsApp or Telegram) for being faster and easier to use for daily communication. option_B: Compress the files into a ZIP format without a password to reduce transfer time, trusting that the EU’s internal network is fully secure. option_C: Send the documents as attachments in a standard email, since EU’s email systems are always end-to-end encrypted by default. option_D: Publish the documents on a public cloud server to facilitate immediate access, as the EU promotes transparency and open access to all information. option_E: Use an official and encrypted communication channel provided by the EU or a authorized secure collaboration platform, ensuring that only authorized recipients have access. Explanation: 1) **Why the correct answer is E:** Option E is correct because data security and protection of confidential information are fundamental pillars of the operation of the SEAE and the EU in general. According to the principles of cybersecurity of the EU and the SEAE guidelines on their work abroad, the transmission of sensitive data must be carried out exclusively through official and encrypted channels that meet the strict security standards of the Union. This guarantees the confidentiality and integrity of the data, protecting both the institution and EU citizens. 2) **Why the incorrect answers are wrong:** - Option A is wrong because it assumes that standard email is always end-to-end encrypted; in reality, while EU systems have security measures, the transmission of highly confidential data requires specific protocols and identity verification that a standard email does not guarantee without additional configurations. - Option B is wrong because compressing files without a password removes any layer of security, leaving the data vulnerable to interception if the network is compromised, which violates basic data protection principles. - Option D is wrong and dangerous because publishing confidential data on a public access cloud server contradicts the principles of data protection (GDPR) and information security, as anyone could access them. - Option C is wrong because personal messaging apps do not meet the security, audit, and data sovereignty requirements of the EU, exposing sensitive information to privacy risks and unauthorized access. 3) **Quick Tip:** Always remember: in EU digital security, 'safe' means 'official authorized channel', never 'fast' or 'convenient'.