Let y1 (t) and y2(t) be solutions of y' (t) + p(t)y (t) + q(t)y(t) = 0 (1) 1. None of the above 2 clyi(t) + c212(t) is also a solution of (1) then 3. y1 (t) and y2(t) are a fundamental set of solutions of (1) O 4. 31 (t) and yz(t) are linearly independent 5. All of the above 6. the Wronskian of 1/1 and 3/2 is nonzero