Which Front End Optimization technique overcomes the parallel download limitation of web browsers?

Which Front End Optimization technique can a Citrix Engineer enable on the Citrix ADC to remove all excess whitespace from a file?

Scenario: A Citrix Engineer is implementing Citrix Web App Firewall to protect a new web application. The engineer has created a profile, configured the relaxation rules, and applied signature protections. Additionally, the engineer has assigned the profile to a policy and bound the policy to the application.
What is the next step for the engineer in protecting the web application?

A Citrix Engineer needs to configure the authentication feature on NetScaler Management and Analytics System (NMAS) to enable local authentication to take over if the external authentication fails.
What can the engineer configure to meet this requirement?

Scenario: A Citrix Engineer has deployed Front-end Optimization on NetScaler. Below is the snippet of the content before and after optimization.
Before Optimization:

After Optimization:

Which optimization technique has been applied to the content?