Which of the following is correct for the nature of the roots x5 – a0x4 + 3ax3 + bx2 + cx + d = 0 if it is given that 2a02 < 15 and a0, a, b, c, d are real?

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Which of the following is correct for the nature of the roots x<sup>5</sup> – a<sub>0</sub>x<sup>4</sup> + 3ax<sup>3</sup> + bx<sup>2</sup> + cx + d = 0 if it is given that 2a<sub>0</sub><sup>2</sup> < 15 and a<sub>0</sub>, a, b, c, d are real?