Let the variable x be "dog" and the variable y be "cat". Write the values returned by the following operations: a$.$ x $+$ y b$.$ "the $"+$ x $+"$ chases the $"+$ y c$.$ x $*42.$ Write a string that contains your name and address on separate lines using embedded newline characters. Then write the same string literal without the newline characters. $3.$ How does one include an apostrophe as a character within a string literal? $4.$ What happens when the print function prints a string literal with embedded newline characters? $5.$ Which of the following are valid variable names?