Which version of PIX introduces support for the VPN accelerator card?

A.
Version 4.0

B.
Version 4.3

C.
Version 5.0

D.
Version 5.3

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