Which of the following functions y = f(x) satisfy y' = - 
y, f(1) = 1?(I) y = ex(II)y = e-2/3x(III)y = e(-2/3)(x - 1)(IV)y = - 
ex
A. I and II
B. III only
C. IV only
D. II only
E. none of these
Answer: B
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A. 
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