What version of the Cisco PIX Firewall is required to use the VPN accelerator card?

A.
Version 2.3 or higher.

B.
Version 3.3 or higher.

C.
Version 4.3 or higher.

D.
Version 5.3 or higher.

E.
Version 6.3 or higher.

Explanation:

System Requirements
Operating System: PIX OS v5.3(1) or later (with DES or 3DES license) Platforms: PIX 515/515E, 520, 525, 535 (limit one per chassis) Reference: Cisco PIX 500 Series Firewalls – Cisco PIX Firewall VPN Accelerator Card