If the tangent at point $(1, 2)$ on the curve $y = ax^2 + bx + \frac{7}{2}$ is parallel to the normal at point $(-2, 2)$ on the curve $y = x^2 + 6x + 10$,then:
- A$a = 1$
- B$a = -1$
- C$b = -\frac{15}{2}$
- D$b = \frac{5}{2}$
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