Which of the following selector is used to selects the element

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Which of the following selector is used to selects the element that is the nth child of its parent?

1. :last-of-type
2. :first-of-type
3. :nth-child(n)
4. ::first-line
5. None of these

Correct Option: C

div:nth-child(2) {background-color: red;}
/* sets the background color to red if the div is its parent’s second child */