We know from the triangle inequality that the last side, $s$, fulfills $s+3\textgreater4$. Therefore, $P\textgreater4+4$. The least integer value of $P$ is $9$ 
For $\triangle ABC$, all its side lengths are integers. The perimeter of $\triangle ABC$ with a side of length $3$ and a side length of $4$ is at least ． 
a) $$7$$ 
b) $$8$$ 
c) $$9$$ 
d) $$12$$ 