What is the purpose of an internal segmentation firewall (ISFW)?

What is the purpose of an internal segmentation firewall (ISFW)?
A . It inspects incoming traffic to protect services in the corporate DM
C . It is the first line of defense at the network perimeter.
D . It splits the network into multiple security segments to minimize the impact of breaches.
E . It is an all-in-one security appliance that is placed at remote sites to extend the enterprise network.

Answer: C

Explanation:

ISFW splits your network into multiple security segments. They serve as a breach containers from attacks that come from inside.