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 first child of its parent that is of its type?

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

Correct Option: B

strong:first-of-type {font-size: bigger;}
/* sets the font size bigger on the first strong tag of its parent */