Joint Entrance Examination/AIEEE 2009/Q001 equations

If the roots of the equation bx2+cx+a=0 be imaginary, then for all real values of x, the expression 3b2x2+6bcx+2c2  is
 * (1) less than –4ab
 * (2) greater than 4ab
 * (3) less than 4ab
 * (4) greater than –4ab