Answer the following statements true (T) or false (F)

1. When you call a method that has a reference parameter, you must also write the keyword ref before the argument.
2. When you pass an argument to a ref parameter, that argument must already be set to some value.
3. When you call a method that has an output parameter, you must also write the keyword out before the argument.
4. A method that has an output parameter must set the output parameter to some value before it finishes executing.

1. true
2. true
3. true
4. true