The sign of the quardratic ppolynomial `ax^2+bx+c` is always positive if

Options

A. a is positive and `b^2-4acle0`
B. a is positiv and `b^2-4acge0`
C. a can be any real number and `b^2-4acle0`
D. a can be any real number and `b^2-4acge0`