Which of the following are examples of coordinate headings?
a. ii, 2, b
b. 3, b, iii
c. a, i, a
d. a, b, c

Coordinate headings enable one to see which of the topic or phrases are of higher importance. It enables the writer to maintain a coherent and consistent document. The examples that are coordinate headings are letter D., A, B, C. This is because they are arranged alphabetically.

the answer would be a

they are called librarians..

itna bhi nai