Which setting is responsible for reducing the server load, improving response time, and increasing the...

Correct Answer: D. Session reuse

Short Explanation with reference:

Session reuse is a feature that allows the Citrix ADC appliance to reuse an existing SSL session between the client and the server, instead of creating a new one for each request1. This reduces the server load, improves response time, and increases the number of SSL transactions per second on an SSL vServer, as the session establishment process involves expensive cryptographic operations2. Session reuse is enabled by default on the Citrix ADC appliance, but it can be disabled or configured with different options1.

1: Configuring Session Reuse | NetScaler 2: Lightboard Lessons: SSL Transactions Per Second - DevCentral - F5, Inc.