In the above figure from left to right, the correct order of the shaded levels are

A. Network level, application level, transport level
B. Application level, network level, transport level
C. Transport level, application level, network level

D. Network level, transport level, application level

Explanation: IP/IPSec is the Network level, SSL or TLS is the Transport Level, Kerberos and S/MIME are the Application level.