Which of the following are methods you can use to insert the AVERAGE function in a formula? Select all the options that apply.

A) AutoSum arrow
B) Insert Function dialog box
C) Insert Formula dialog box
D) Typing and using Formula AutoComplete

A) AutoSum arrow: This is the quickest way to insert the AVERAGE formula as it allows you to select the cell range and inserts the AVERAGE function automatically.
B) Insert Function dialog box: This is a more detailed approach to inserting the AVERAGE function as it provides options to select the function, choose the cell range, and set additional parameters.
C) Insert Formula dialog box: This is not a valid option as it only allows you to create custom formulas, and not select pre-existing functions like AVERAGE.
D) Typing and using Formula AutoComplete: This is a quick way to insert the AVERAGE function as you just start typing "=AVERAGE(" and Formula AutoComplete will provide suggestions based on the cell range you select.