How can the administrator meet the needs of this environment?

Scenario: A company recently acquired three smaller companies; this adds more than 1500 employees to the company. The current NetScaller appliance does NOT support adding that many users. A Citrix Administrator needs to use a Multi-Tenancy solution, giving each newly acquired company its own NetScaler for VPN access, load balancing, and at least 20 GBPS of throughput.

How can the administrator meet the needs of this environment?
A . Install XenServer and configure a NetScaler VPX 3000 for each newly acquired company.
B . Purchase a NetScaler MPX appliance for each newly acquired company.
C . Purchase a NetScaler CPX for each newly acquired company.
D . Purchase a NetScaler SDX appliance and configure a NetScaler Instance for each newly acquired company.

Answer: D