The Decay Factor of an Exponential Function $P ( t )$

Multiple Choice

The decay factor of an exponential function $P ( t )$ is 0.43. The initial value is 1.24. Then a formula for P is

A) $P = 0.43 \times t ^ { 124 }$
B) $P = 0.43 \times 1.24 ^ { t }$
C) $P = 1.24 \times t ^ { 0.43 }$
D) $P = 1.24 \times 0.43 ^ { t }$