Which of the following is incorrect about the proper use of parentheses?

Which of the following is incorrect about the proper use of parentheses? Parentheses are used to set off structurally independent elements.

b.

Parentheses are used to enclose text within other parentheses.

c.

Parentheses are used introduce an abbreviation in the text.

d.

Parentheses are used to set off in-text citations