Simplify the expression by combining like terms. Then, classify the simplified expression by degree and number of terms.
p^4 − 4p + 2p(p^3 + 6)
The simplified expression is ______.
Therefore, the simplified expression is ___ (A. 2nd B. 4th C. 3rd or D. 1st) degree ______ (A. trinomial B. monomial or C. binomial)