How many tetrahedral holes are occupied in diamond ?

Diamond structure is based on a face centred cubic lattice where four out of the eight tetrahedral holes are occupied by carbon atoms. Every atom in this structure is surrounded tetrahedrally by four other carbon atoms. How many carbon atoms per unit cell in diamond structure ?

Assertion: Diamond has a ccp arrangement in which corners, face centres and alternate tetrahedral holes are occupied by C atoms Reason: In diamond, C atoms at corners are sp^(3) hybridised but at the face centres these are sp^(2) hybridised

Assertion: Diamond has a ccp arrangement in which corners, face centres and alternate tetrahedral holes are occupied by C atoms Reason: In diamond, C atoms at corners are sp^(3) hybridised but at the face centres these are sp^(2) hybridised

Assertion: Diamond has a ccp arrangement in which corners, face centres and alternate tetrahedral holes are occupied by C atoms Reason: In diamond, C atoms at corners are sp^(3) hybridised but at the face centres these are sp^(2) hybridised