If x2+2ax+4>0x^2 + 2ax + 4 > 0x2+2ax+4>0 for all real xxx, which of the following is true for aaa?
∣a∣<2|a| < 2∣a∣<2
a>2a > 2a>2
a<−2a < -2a<−2
∣a∣>2|a| > 2∣a∣>2