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if p,q,r be real then the interval in...

if p,q,r be real then the interval in which f(x) `=|underset(pr" "qr" "x+r^(2))underset(pq" "x+q^(2)" "qr)(x+p^(2)" "pq" "pr)|,`

A

increase is `x lt -(2)/(3) (p^(2) +q^(2)+r^(2)), x gt0`

B

decrease is `(-(2)/(3)(p^(2) +q^(2)+r^(2)),0)`

C

decrease is `x lt - (2)/(3) (p^(2) +q^(2)+r^(2)) x gt 0`

D

increase is `(-(2)/(3) (p^(2)+q^(2)+r^(2)),0)`

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