Who does No.2 receive "Cabin Secure" from?

The correct choice indicates that No.2 receives "Cabin Secure" from No.3, which is an essential part of the communication protocol during safety checks on an aircraft. This procedure ensures that all cabin crew members are informed that the cabin is secure before takeoff. Each crew member has specific roles, and it's part of their responsibilities to relay safety information effectively.

In the context of cabin safety, No.3 plays a vital role in the communication chain, as they are generally positioned in a way to perform their duties while also being aware of the actions of the other crew members. By receiving the "Cabin Secure" message from No.3, No.2 is verifying that all safety protocols have been followed and that the cabin environment is ready for an upcoming flight.

The other choices likely represent other crew positions but do not align with the established protocol for the cabin crew communication process regarding securing the cabin. Therefore, the decision made in selecting No.3 as the source of the "Cabin Secure" message reflects an understanding of the operational hierarchy and the importance of accurate communication amongst crew members.