Using the OSI reference model, what layer(s) is/are used to encrypt data?

Using the OSI reference model, what layer(s) is/are used to encrypt data?
A . transport layer
B . Session layer
C . Session and transport layers
D . Data link layer

View Answer

Answer: C

Explanation:

User applications often encrypt and encapsulate data using protocols within the OSI session layer or farther down in the transport layer.