How many significant figures does the number 3 600 have?​

How many significant figures does the number 3 600 have?​

A. 1

B. 2

C. 3

D. 4

​E. One cannot tell with certainty when the number is written in the given form, but it will be one of the other given answers.

The answer is :

​E. One cannot tell with certainty when the number is written in the given form, but it will be one of the other given answers.