Answer:
Answers in explanation. Try to ask one question at a time, it is easier for people to answer single questions and you will get answers faster.
Explanation:
15. A
16. D
17. B + C
18. A+B+D
19. B+C+D
**20. is NOT Planned personal leave for documentation developers and proof readers. The other 4 answers are correct
21. Presentation notes + Outline
22.B
23.D (im not entirely sure about this one)
no it is not but u will need a ethernet cord
Ummmmmm... Dr. Boyd is a Psychologist that has nothing to do with computers and technology
Answer:

Explanation:
Given
Options A to D
Required
Which deletes the first occurrence of 3
The options show that the question is to be answered using the knowledge of Python.
So, we analyze each of the options using Python syntax
(a) listB.clear(3)
In python, clear() is used to delete all elements of a list, and it does not take any argument i.e. nothing will be written in the bracket.
<em>Hence, (a) is incorrect</em>
(b) listB(3)
The above instruction has no meaning in Python
(c) listB delete(3)
The above instruction as written is an invalid syntax because of the space between listB and delete.
Also, it is an invalid syntax because lists in Python do not have the delete attribute

This removes the first occurrence of 3