The angle of elevation of a cloud from a point h meters above a lake is ∅. The angle of
depression of its reflection the lake is 45 ^∘  . The height of the cloud is 
(a) h tan (45 ^∘ +∅) (b) h cot (45 ^∘ - ∅ ) (c) h tan (45 ^∘ - ∅ ) (d) h cot (45 ^∘ +∅ )