State whether the following are valid switch statements. If not, explain why. Assume that n and digit are int variables.

a) switch (n <= 2) { case 0: cout << "Draw." << end1; break; case 1: cout << "Win." << end1; break; case 2: cout << "Lose." << end1; break; }

b) switch (digit / 4) { case 0, case 1: cout << "low." << end1; break; case 1, case 2: cout << "middle." << end1; break; case 3: cout << "high." << end1; }

c) switch (n % 6) { case 1: case 2: case 3: case 4: case 5: cout << n; break; case 0: cout << end1; break; }

d) switch (n % 10) { case 2: case 4: case 6: case 8: cout << "Even"; break; case 1: case 3: case 5: case 7: cout << "Odd"; break; }