Select correct statement(s) regarding σ and π-bonds:
a. σ -bond lies on the line joining the nuclei of bonded atoms
b. π -electron cloud lies on either side to the line joining the nuclei of bonded atoms
c. (2pπ−3dπ)π -bond is stronger than (2pπ−3pπ)π -bond.
d. σ -bond has primary effect to decide direction of covalent bond, while π -bond has no primary effect in direction of bond