What can be causing this high load?

Scenario: A Citrix Administrator has set up a XenApp environment using the default settings for load management. The administrator looks at the load value of a specific server and notices a load of 80%.

What can be causing this high load?
A . Number of user sessions on the server is 200.
B . CPU usage is 80%.
C . Memory usage is 80%.
D . Number of concurrent logons is 4.

Answer: A