`A={x^(2)-9x+20=0},`
`B={x ^(2)+13 x + 42=0}`
`C={x^(2) -3x-70=0}and ` the universal set `X ={-7,-6,4,5,10,12}, ` then `Ann(BnnC)=`

Options

A. 1) `{-7,-6,4,5,10}`
B. 2) `{4,5,10}`
C. 3) `{-7,4,5,10}`
D. 4) `phi`

Answer

D