Answer:
c) put a $ in front of the letter and number that represents the cell position.
Explanation:
Dollar sign ($) is used to lock the formula in the cell. This is called absolute reference. In this type of referencing, A dollar sign is place in front of the letter and number to lock that cell. Whenever we copy that cell, the formula will be copied in other cell without changing its reference number.
As
Example 1
C1 = A1 + B1
if we copy this formula in C2 then it becomes
C2= A2 + B2
there both reference of A and B has been changed.
Example 2
If we put $ sign as
C1= $A$1 + $B$1
now of we copy C1 and into C2
C2= $A$1 + $B$1
There reference of cell is not changed.