Why Is It Important for a System Analyst to Document

Multiple Choice

Why is it important for a system analyst to document formal as well as informal systems within an organization?

A) informal systems are always less efficient.
B) the usage of an informal system by users means that the formal system is deficient in some way and users have designed ways to work around it.
C) informal systems require natural language processing, but formal systems do not.
D) all of the above