24. Let the positive numbers $\mathrm { a } , \mathrm { b } , \mathrm { c } , \mathrm { d }$ be in A.P. Then $\mathrm { abc } , \mathrm { abd } , \mathrm { acd } , \mathrm { bcd }$ are:
\section*{III askllTians ||}
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(A) NOT in A.P./G.P/H.P.\\
(B) In A.P\\
(C) In G.P\\
(D) In H.P\\