Consider the following diagram. Which of the following pairs of statements is true?

Ia. **A − B = C**

Ib. **A − D = C**

Ic. **A − C = B**

Id. **B − A = C**

IIa. **A = D − C**

IIb. **A = D − B**

1. Ia, IIb

2. Ic, IIb

3. Id, IIa

4. Id, IIb

5. Ib, IIb

6. Ib, IIa

7. Ic, IIa

8. Ia, IIa

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