Answer: D) Procedure
Step-by-step explanation:
Chris is writing a step by step procedure to the end users for providing all the relevant instruction regarding the security of the software on the computer system. The procedure contain all the detailed and complete instruction for achieving the given objective. Therefore, Option (D) is correct.
All the other options are not much effective because Policy, standard and guideline are the set of principle which does not involve with the step by step instruction and it does not explain in detailed information.