Which of the following describes the BEST approach for deploying application patches? 

Answer options:

A. Apply the patches to systems in a testing environment, then to systems in a staging environment, and finally to production systems.
B. Test the patches in a staging environment, develop against them in the development environment, and then apply them to the production systems.
C. Test the patches in a test environment, apply them to the production systems, and then apply them to a staging environment.
D. Apply the patches to the production systems, apply them in a staging environment, and then test all of them in a testing environment.

A