What Type of Orbitals Overlap to Provide Stability to the Tert-Butyl

What type of orbitals overlap to provide stability to the tert-butyl carbocation by hyperconjugation?

A) 3 $\degree$ C 2p atomic orbital + 3 $\degree$ C sp² atomic orbital
B) 3 $\degree$ C 2p atomic orbital + methyl C-H s molecular orbital
C) 3 $\degree$ C sp² atomic orbital + methyl C-H s molecular orbital
D) 3 $\degree$ C 2p atomic orbital + methyl C 2s atomic orbital