If A $$\times$$ B means that A is the mother of B, A - B means that A is the father of B, A $$\div$$ B means that A is the sister of B, then which of the following expression shows that P is
the paternal grandmother of R?

A

$$P \div R - Q$$

B

$$P \times Q \div R$$

C

$$Q \times P - R$$

D

$$P \times Q - R$$