What is the differential equation of all parabolas whose directrices a – McqOptions

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1.	What is the differential equation of all parabolas whose directrices are parallel to the x-axis?
A.	d<sup>3</sup>x/dy<sup>3</sup> = 0
B.	d<sup>3</sup>y/(dx<sup>3</sup> + d<sup>2</sup>y/dx<sup>2</sup>) = 0
C.	d<sup>3</sup>y/dx<sup>3</sup> = 0
D.	d<sup>2</sup>y/dx<sup>2</sup> = 0
Answer» D. d<sup>2</sup>y/dx<sup>2</sup> = 0

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