What is the difference between SSL VPN and IPSec VPN?

What is the difference between SSL VPN and IPSec VPN?
A . IPSec VPN does not require installation of a resident VPN client
B . SSL VPN requires installation of a resident VPN client
C . SSL VPN and IPSec VPN are the same
D . IPSec VPN requires installation of a resident VPN client and SSL VPN requires only an installed Browser

Answer: D