Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms. After the formation of four bonds, carbon attains the electronic configuration of:
a) 1s² 2s² 2p²
b) 1s² 2s² 2p³
c) 1s² 2s² 2p⁴
d) 1s² 2s² 2p⁶