From a point $P$ on the ground,the angle of elevation of the top of a $10 \ m$ tall building is $30^{\circ}$. $A$ flag is hoisted at the top of the building,and the angle of elevation of the top of the flagstaff from $P$ is $45^{\circ}$. Find the length of the flagstaff. (Take $\sqrt{3} = 1.732$) (In $m$)
- A$10(\sqrt{3}+2)$
- B$10(\sqrt{3}+1)$
- C$10 \sqrt{3}$
- D$7.32$
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