Which of the following is true ?
A. The electron density in the xy- plane in `3d_(xy)` orbital is zero
B. The electron density in the xy- and xz plane in `3d_(yz)` orbital is zero
C. The electron density in the xy- plane in `3d_(x^(2)` orbital is zero
D. Pauli excussion principle is folloed by bosons which have integral spin