Variable separable

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A differential equation is said to be of variable separable type if?
A
It can be written as dy/dx + P(x)y = Q(x)
B
It can be written in the form M(x)dx + N(y)dy = 0
C
It involves only second derivatives
D
It cannot be solved by integration
Analysis & Theory

A variable separable DE can be expressed as M(x)dx + N(y)dy = 0.