Consider the systems, each consisting of m linear equations in n variables.I. If m < n, then all such systems have a solutionII. If m > n, then none of these systems has a solutionIII. If m = n, then there exists a system which has a solutionWhich one of the following is CORRECT?

• A. I, II and III are true
• B. Only II and III are true
• C. Only III is true
• D. None of them is true