Which of the following is true about the General Principles of the List of Subject Headings?

(A). Subject headings should employ terms in common usage, following prevalent spelling and terminology conventions.

(B). Documents should be indexed under the most precise subject heading that accurately reflects their content. 

(C). Subject headings do not need to maintain consistency and reflect current usage.

(D). Uniform headings must be chosen from synonymous terms, avoiding ambiguity and ensuring consistency across documents