A good source of security for an exterior door is?

A rim lock is an effective security feature for an exterior door because it is designed to provide a higher level of protection compared to other options. Rim locks are mounted on the surface of the door, making them less susceptible to being easily compromised than some internal lock mechanisms. Their design allows for a robust locking mechanism that can offer an additional layer of security beyond standard doorknob locks.

In contrast, hollow core doors generally lack the structural integrity needed for reliable security, making them less effective as exterior doors. Chain locks, while they can prevent someone from pushing a door open, do not provide adequate security against someone who may try to break through the door or bypass the lock. Regular knob locks can be vulnerable to various forms of manipulation or force, making them less reliable for securing an exterior entrance. A rim lock, with its durability and secure mounting, helps fortify an entry point against unauthorized access, making it the superior choice.