Answer:
Option A): the equal sign ( = )
Step-by-step explanation:
Formulas used in excel are most important as they calculate many entries giving the exact result. More importantly, Excel uses the references to cells in construction of formulas so that if the value inside the cell is changed the output change automatically.
When entering a function or formula in a cell, the equal sign (=) is the first character you must type.
Equal sign when used as a first character, signals the excel to produce a logical result after calculation.
i hope it will help you!