What size network is best suited for the Cisco PIX Firewall 525 or 535?

A.
Small office or home office.

B.
Small business or branch office.

C.
Midsize enterprise.

D.
Large enterprise or service provider.

Explanation:
The Cisco PIX Firewall 525 is a large, enterprise perimeter firewall solution. The Cisco PIX firewall 535 delivers carrier-class performance to meet the needs of large enterprise networks as well as service providers. Ref: Cisco Secure PIX Firewalls (Ciscopress) Page 26