Determine whether each of the following statements about CH3+, CH3−, and CH4 is true or false:

a. All three have the same hybridization at the C atom.

b. All three have an unhybridized orbital on the C atom.

c. The H—C—H angles in CH3+ are larger than those in the other two.

d. CH3− and CH4 have the same electron-domain geometry.