2749. m1 and m2 are the members of two individual simple trusses of a compound truss. The compound truss will be rigid and determinate if__________________?

A. m = m1 + m2
B. m = m1 + m2 + 1
C. m = m1 + m2 + 2
D. m = m + m + 3
✅ The correct answer is option D.

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