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Q1.
If y1(x) and y2(x) are two linearly independent solutions to the second-order homogeneous linear ODE y'' + P(x)y' + Q(x)y = 0 on an interval I, what does Abel's identity state regarding their Wronskian W(x)?

(A)
W(x) = C * exp(- integral P(x) dx)
(B)
W(x) = C * exp(integral Q(x) dx)
(C)
W(x) is always identically zero on I
(D)
W(x) = C * (y1' * y2')
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