Refer to the Following Formula: (∃X)[Mx • (∼Nc $\lor$

Multiple Choice

refer to the following formula: (∃x) [Mx • (∼Nc $\lor$ ∼Ox) ] ≡ (Py • Pb)
-Which of the following variables in the formula are free?

A) The x that follows the M.
B) The y that follows the P.
C) The x that follows the O.
D) All of the above.
E) None of the above.