whiCh oF thE Following CAn BEst sum up thE pAssAgE
A．mEDiA sElECtion in mAnAging inFormAtion rEsourCEs.
B．thE importAnCE AnD nECEssity oF mEDiAConvErsion.
C、thrEECAtEgoriEs oF inFormAtion mEDiA、
D．vArious mEAns oFCommuniCAting inFormAtion.