Assertion (A): If ΔABC is equilateral, then cos A + cos B + cos C = sin A + sin B + sin C.

Reason (R): In isosceles right angled triangle ABC, cos A + cos C = sin A + sin C.

1. Assertion (A) is true, Reason (R) is false.

2. Assertion (A) is false, Reason (R) is true.

3. Both Assertion (A) and Reason (R) are true, and Reason (R) is the correct reason for Assertion (A).

4. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct reason (or explanation) for Assertion (A).