Which of the Following Are Polynomials:
A) $y=15 x^{4}$ B) $y=\left(x^{2}+3\right)(x-15) e^{x}$

Multiple Choice

Which of the following are polynomials:

A) $y=15 x^{4}$
B) $y=\left(x^{2}+3\right) (x-15) e^{x}$
C) $y=1-15 t+\sqrt{3 t^{5}}$
D) $y=1-15 t+\sqrt{3} t^{5}$