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A$(-4, 5)$ and C$(8, 2)$ are the two opposite vertices of a parallelogram ABCD. Its diagonals intersect each other at P$(a, b)$. The relation between 'a' and 'b' is:
- (a)$b = a - 1.5$
- (b)$b = a + 1.5$
- (c)$b = a - 4.5$
- (d)$b = a + 4.5$
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(B) $b = a + 1.5$