Solve the Problem $E$ Is Modeled By $\mathrm { E } = 2.7 \cos 30 \pi \mathrm { t }$

Multiple Choice

Solve the problem.
-For an electrical circuit, the voltage $E$ is modeled by $\mathrm { E } = 2.7 \cos 30 \pi \mathrm { t }$ , where $t$ is the time in seconds. How many cycles are completed in one second?

A) $30 \pi$ cycles
B) $2.7$ cycles
C) 30 cycles
D) 15 cycles