Which of the following are components of ad unit specifications?

Ad dimensions and aspect ratio are crucial components of ad unit specifications because they define the physical size and proportional relationship of an ad creative. Ad dimensions (e.g., 300x250 pixels) specify the exact width and height, ensuring the ad fits correctly into designated inventory slots. Aspect ratio (e.g., 16:9, 1:1) describes the proportional relationship between the ad's width and height, which is vital for responsive ad designs that adapt across various screen sizes without distortion. Ad text is the content within the ad, not a specification of the unit itself. Maximum weight refers to the file size limit, which is a technical constraint but not a fundamental component defining the ad unit's structure.