Two identical cones are joined as shown in the figure. If radius of base is $4$ cm and slant height of the cone is $6$ cm, then height of the solid is:

Two identical cones are joined as shown in the figure. If radius of base is $4$ cm and slant height of the cone is $6$ cm, then height of the solid is:

(A) $8$ cm 
(C) $2 \sqrt{5}$ cm 
(B) $4 \sqrt{5}$ cm 
(D) $12$ cm
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