The diagram shows cross-cutting relationships among rocks.

3 dimensional representation of cross-cutting relationships. left side, labeled b, c, e, and f. right side labeled a and d. a: fault line that goes through wavy layers of rock, starting at b, and ending at the bottom of c. b: bottom layer surrounded by wavy layers of rock and ending at c. c: horizontal layer below e. d: rock layer extends from bottom of b to top of e, crossing through wavy rock layer. e: earth apostrophe s crust. f: fault line that goes through all layers.

which statement accurately describes the geologic features?

d occurred after b.
d occurred before a.
a formed after the horizontal layer above was deposited.
f formed before the horizontal layer above was deposited.