What security measures are in place for the classroom?

The correct choice highlights the important practice of keeping classroom doors locked during academy activities. This measure serves multiple purposes: it helps to prevent unauthorized access, which is critical for maintaining a secure learning environment, and it enhances the safety of both students and instructors. By ensuring that doors are locked, the academy minimizes the risk of theft and potential safety breaches. It allows staff to maintain control over who enters and exits the classroom, contributing to overall security.

In contrast, keeping windows open for ventilation could compromise security by allowing easy access or visibility from outside. Holding classes outdoors for security reasons may not provide a controlled environment conducive to learning and could introduce additional security concerns. The presence of security personnel in the classroom can enhance safety, but relying solely on their presence does not replace the fundamental importance of implementing strong access control measures, such as locking doors.