Consider the initial value problem \(y'(t)=f(t)y(t),y(0)=1,\) where \(f:\mathbb{R}\rightarrow\mathbb{R}\) is continuous. Then this initial value problem has
(a) indefinitely many solutions for some \(f\).
(b) a unique solution in \(\mathbb{R}\).
(c) no solution in \(\mathbb{R}\) for some \(f\).
(d) a solution in the interval containing 0, but not on \(\mathbb{R}\) for some \(f\).