1,2-Butadiene has
(a) only sp hybridized carbon atoms
(b) only sp2 hybridized carbon atoms
(c) only sp3 hybridized carbon atoms
(d) sp, sp2, sp3 hybridized carbon atoms
(a) only sp hybridized carbon atoms
(b) only sp2 hybridized carbon atoms
(c) only sp3 hybridized carbon atoms
(d) sp, sp2, sp3 hybridized carbon atoms