4. Among the following functions, which one is both an even function and has a zero point? (A) $y = \ln x$ (B) $y = x ^ { 2 } + 1$ (C) $y = \sin x$ (D) $y = \cos x$
4. Among the following functions, which one is both an even function and has a zero point?\\
(A) $y = \ln x$\\
(B) $y = x ^ { 2 } + 1$\\
(C) $y = \sin x$\\
(D) $y = \cos x$