$$m_1$$ and $$m_2$$ are the members of two individual simple trusses of a
compound truss. The compound truss will be rigid and determinate if

A

$$m= m_1+ m_2$$

B

$$m= m_1+ m_2+1$$

C

$$m= m_1+ m_2+2$$

D

$$m= m_1+ m_2+3$$