Answer: valid main method : Questions « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Questions

B, D. 

public class MainClass {
  public static void main(String[] args) {
    for (int i = 0; i < 10; i++) {
      System.out.println(i);
    }
  }

}

public class MainClass {
  public static void main(String args[]) {
    for (int i = 0; i < 10; i++) {
      System.out.println(i);
    }
  }

}