A capital asset forming part of a decedent's gross estate takes as its basis:
a. the fair market value of the asset as determined for federal estate tax purposes.
b. the higher of the decedent's basis in the asset or the fair market value of the asset as determined for federal estate tax purposes.
c. the lower of the decedent's basis in the asset or the fair market value of the asset as determined for federal estate tax purposes.
d. the decedent's basis in the asset.