How do an enzyme and substrate to one another? what is the lock and key model of enzyme function?

The lock and key model is where the substrate has a specific shape which can fit into the specific shape of the active site of the enzyme, just like how a key has a specific shape which can fit into a specific lock.

In other words, the substrate is complementary (same shape) to a specific enzyme, so the substrate can bind/fit to the enzyme.

The answer is going to be a because ik that i’m right