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Man, $A$ has a defect of vision due to which he cannot see the nearby objects clearly $($though he can see the distant objects clearly$)$. On the other hand, man $B$ has a defect of vision due to which he cannot see the distant object clearly $($though he can see the nearby objects clearly$)$. The defect in man $A$ can be corrected by using spectacles containing lenses $C$ whereas the defect in man $B$ can be corrected by using spectacles containing lenses $D.$
$a.$ Name the defect of vision in man $(i) A$, and $(ii) B.$
$b.$ What type of lenses are $(i) C,$ and $(ii) D?$