Hey Natasha, following methods are used to deSelect an option/options of a dropdown in Selenium Webdriver:
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deselectByVisibleText(): This method removes the selected item from list for particular option:
 
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deselectByValue(): Deselect option from list by using value of particular option:
 
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deselectByIndex(): This method removes the selection by index value of the option. Index values of the list are always in integer:
 
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deselectAll(): Method is able to Deselect all Selected options from Multi-Select Dropdown: