How many rows appear in a truth table for each of these compound propositions?
a) $p \rightarrow \neg p$
b) $(p \vee \neg r) \wedge(q \vee \neg s)$
c) $q \vee p \vee \neg s \vee \neg r \vee \neg t \vee u$
d) $(p \wedge r \wedge t) \leftrightarrow(q \wedge t)$