Final answer:
To check if the correct creative sizes are sent with a bid request in programmatic advertising, the Bid Request Validator is the tool commonly used.
Step-by-step explanation:
A bid request enables the purchase of ad inventory to display ads. It keeps track of information about the user and the devices they are using. Therefore, advertisers can compete for specific ad spaces on a publisher's website and provide the most relevant ads to users.
To identify if the correct creative sizes are sent with the bid request, the correct tool to use would be the Bid Request Validator. This tool analyzes incoming bid requests to ensure that all the necessary information, including the size of the creative, is properly transmitted and aligns with the specifications prescribed by the advertising platform.
Using the Bid Request Validator, you can catch errors or mismatches in creative sizes which can potentially lead to ad delivery issues. By ensuring that the creative sizes sent with the bid request are correct, advertisers can prevent discrepancies between the ad content and the space available, thus maintaining ad quality and effectiveness.