What are the coordination numbers of $bcc$,$scc$,and $fcc$ respectively?

The correct coordination number for the zinc ion in the zinc blende crystal structure is:

An element crystallizes in a $bcc$ lattice. The number of nearest neighbors of the element is

The coordination number of the point $B$ for a solid with the following structure is:

$A$ cubic lattice has atoms of $A$ at the body centre,atoms of $B$ at the corners of the cube and atoms $C$ at all the face centres. What is its formula?

Platinum crystallizes in a face-centered cubic $(FCC)$ crystal with a unit cell edge length $a$. The distance between nearest neighbour atoms is