What is the difference between a standard and a guideline?

A.
Standards are compulsory and guidelines are mandatory

B.
Standards are recommendations and guidelines are requirements

C.
Standards are requirements and guidelines are recommendations

D.
Standards are recommendations and guidelines are optional

Explanation:
Answer C is correct; Standards are requirements (mandatory) and guidelines are recommendations.

Incorrect Answers and Explanations: A, B, and D: Answers A, B, and D are incorrect. For A, Guidelines are recommendations (compulsory and mandatory are synonyms). Answer B has the recommendations and requirements flipped. For D, standards are mandatory, not recommendations.