Select the best answer regarding your observation from step 1.9. a. both s(t) and b(t) appear as identical sine waves b. both s(t) and b(t) appear as identical cosine waves c. both s(t) and b(t) appear as cosine waves; however, their amplitudes differ d. s(t) appears as a cosine wave while b(t) appears as a sine wave

-2 -8 0 0.001 0.002 0.003 0.004 0.005 0.006 0.007 0.008 0.0090.01 Time (seconds)