What is the relation between function and formula in Excel?

a$.$

A formula and a function are two unrelated features of Excel.

b$.$

A formula is a pre$-$built function that performs specific calculations or operations on data.

c$.$

A formula performs calculations and returns a function within the same worksheet.

d$.$

A function is a pre$-$built formula that performs specific calculations or operations on data.

e$.$

A function is a set of parameters used in a formula for statistical analysis of data.