Given the propositions:
$P$ : The dihedral angles formed by adjacent lateral faces of the pyramid $V-A B C D$ are all equal.
$Q$ : The angles formed by adjacent lateral edges of the pyramid $V$ - $A B C D$ are all equal.
Then among the following four statements, the correct one is
(A) $P$ is a sufficient condition for $Q$, but not a necessary condition
(B) $P$ is a necessary condition for $Q$, but not a sufficient condition
(C) $P$ is both a sufficient and necessary condition for $Q$
(D) $P$ is neither a sufficient condition nor a necessary condition for $Q$
3. (U).

If the base of the quadrilateral pyramid is a rectangle (but not a square) $A B C D$, and the line connecting the vertex $V$ to the center $O$ of the base is perpendicular to the base, then proposition $P$ holds, and $Q$ does not hold.
If the base is changed to a rhombus (but not a square), then proposition $Q$ holds, and $P$ does not hold.