Which of the following statement is true
Referencing a nonexistent macro variable results in a warning message. Referencing an invalid macro variable name results in an error message.
Referencing a nonexistent macro variable results in a error message. Referencing an invalid macro variable name results in an warning message.
Referencing a nonexistent macro variable and invalid macro variable name results in an error message.
Referencing a nonexistent macro variable and invalid macro variable name results in an warning message.