The code defines a function func with a positional parameter message and a keyword parameter num with a default value of 1.

1. The first call, func('Hello'), passes only one argument. message becomes 'Hello', and num uses its default value, 1. The expression 'Hello' 1 evaluates to 'Hello', which is printed.

2. The second call, func('Welcome', 3), passes two arguments. message becomes 'Welcome', and num is set to 3. The expression 'Welcome' 3 evaluates to 'WelcomeWelcomeWelcome', which is printed on a new line.

A. String multiplication concatenates strings without adding spaces. The output would not have spaces between "Welcome".

B. The second function call explicitly passes the string 'Welcome', not 'Viewers'.

C. This option incorrectly omits the output from the second function call, func('Welcome', 3).

E. String multiplication does not insert commas or any other characters between the concatenated instances of the string.

1. Official Python Documentation, The Python Tutorial: Section 4.7.1, "Default Argument Values," explains how a function uses a default value for an argument if no value is passed in the call.

Source: Python Software Foundation. (2023). The Python Tutorial, Section 4.7.1. Default Argument Values. Retrieved from https://docs.python.org/3/tutorial/controlflow.html#default-argument-values

2. Official Python Documentation, The Python Language Reference: Section 6.6, "The multiplication and division operator," describes the operator's behavior with sequence types like strings, stating s n is "equivalent to s concatenated with itself n-1 times."

Source: Python Software Foundation. (2023). The Python Language Reference, Section 6.6. The multiplication and division operator. Retrieved from https://docs.python.org/3/reference/expressions.html#the-multiplication-and-division-operator

3. MIT OpenCourseWare, 6.0001 Introduction to Computer Science and Programming in Python: Lecture 3 notes discuss functions, parameters, and arguments, including the concept of default values for parameters.

Source: Guttag, J. (2016). Lecture 3: String Manipulation, Guess and Check, Approximations, Bisection. MIT OpenCourseWare. Retrieved from https://ocw.mit.edu/courses/6-0001-introduction-to-computer-science-and-programming-in-python-fall-2016/resources/lec3/ (See slides on Functions).