Which of the following methodologies should be selected?

A system’s application servers need to be patched.

The requirements for maintenance work are as follows:

– System downtime is not allowed.

– The application server in use must be in the sane patch status.

– System performance must be maintained during patching work.

– Testing after patching must be done before the application server is in use.

– If any trouble occurs, recover the previous version in ten minutes.

Which of the following methodologies should be selected?
A . Rolling update
B . Patching directly
C . Blue-green deployment
D . Three staging environments