A flagstaff of height 5 m stands on top of a building. From a point on the ground, the angle of elevation of the top of the flagstaff is $60^\circ$ and that of the bottom of the flagstaff is $45^\circ$. Find the height of the building.
Options:
- A: $\dfrac{5}{\sqrt{3}-1}$ m
- B: $\dfrac{5(\sqrt{3}+1)}{2}$ m
- C: 5 m
- D: $5\sqrt{3}$ m
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