PLEASE HELP NOW!!!!!!!!!!! (03.04 MC)

Two exponential functions, f(x) and g(x), are graphed on the same coordinate plane.

Graph of f of x equals 2 to the x power going through points 0 comma 1 and 1 comma 2 and graph of g of x equals 2 to the x power minus 1 going through points 0 comma 0 and 1 comma 1.

What effect does subtracting 1 from the parent function have on the transformed function?

a
Subtracting 1 from the parent function shifts the function up one unit.

b
Subtracting 1 from the parent function shifts the function down one unit.

c
Subtracting 1 from the parent function shifts the function right one unit.

d
Subtracting 1 from the parent function shifts the function left one unit.