You can adjust your bids using Bid adjustments(modifiers) option in Microsoft Advertising. Bid adjustments allow you to change your bids for specific devices. You can use this to increase your bid on your best performing devices so that your ad spend goes towards the ads that target your best performing devices.
This question is a part of the Microsoft Advertising Certified Professional exam. You can find all the answers with detailed explanation for this exam in the Microsoft Advertising Certified Professional exam page.