Which of the following equation are quad...

Which of the following equation are quadratic equations?
`(I) x^2 + 4x + 23 + x + (33)/(28)` (II)`2/3x^2 + 6x + 2 = x^2 + 8` (III) `6x^2 + 4x + 18 = 6x^2 - 6x`

A

I&II

B

I,II & III

C

I & III

D

II & III

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