According to the Treaty of Lisbon and the functions established for the European External Action Service (EEAS), which is the main institutional mission of this service in the context of the Common Foreign and Security Policy (CFSP)? option_A: The EEAS has the exclusive authority to adopt binding decisions on common defense that obligate the Member States to deploy troops in EU missions. option_B: Its main mission is to try to bring coherence and coordination to the Union's international action, operating under the guidance of the High Representative politically. option_C: The EEAS is responsible for the direct execution of the budget of the Common Security and Defense Policy (CSDP), managing the funds of the Recovery and Resilience Mechanism for defense projects. option_D: The EEAS acts as the main executive institution in charge of the daily management of the Eastern Neighborhood Policy, replacing the European Commission in negotiating trade agreements. Explanation: 1) **Why the correct answer is correct:** The official source of the EEAS explicitly states that 'The role of the EEAS is to try to bring coherence and coordination to the Union's international action'. Additionally, the Treaty of Lisbon defines the EEAS as the body that assists the High Representative in exercising its competencies, acting under their political guidance. This coherence is the central objective to avoid the fragmentation of the Union's external action. 2) **Why the incorrect options are incorrect:** - The **option A** uses the trap of **sovereignty and exclusive competence**. The EEAS does not have the authority to *adopt* binding defense decisions on its own; the CFSP is decided by unanimity in the Council, and the deployment of troops depends on the political will of the Member States, not an executive order from the EEAS. - The **option C** makes a **function substitution error**. Although the EEAS coordinates the external action, it does not replace the European Commission in managing the Eastern Neighborhood Policy or negotiating trade agreements (which is the Commission's competence in the common trade policy). - The **option D** confuses **budgetary instruments**. The EEAS does not directly manage the CSDP budget as an independent financial manager, nor does it have any competence over the Recovery and Resilience Mechanism (RRM), which is a post-pandemic economic recovery mechanism mainly managed by the Commission. 3) **Quick Tip:** Remember that the EEAS is the 'brain and voice' that seeks coherence and coordination, but it does not have the autonomous executive power to take binding defense decisions or manage internal economic policy budgets. The key is 'coherence and coordination' under the guidance of the High Representative.