The expression `y = ax^2+ bx + c` has always the same sign as of a if `(A) 4ac < b^2 (B) 4ac > b^2 (C) 4ac= b2 (D) ac < b^2`

The expression `y = ax^2+ bx + c` has always the same sign as of a if `(A) 4ac < b^2 (B) 4ac > b^2 (C) 4ac= b2 (D) ac < b^2`
A. `4 ac lt b^(2)`
B. `4 ac gt b^(2)`
C. `ac lt b^(2)`
D. `ac gt b^(2)`

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