Final answer:
The concept of day parts, which refers to the division of the day into specific time blocks, is true.
Step-by-step explanation:
The statement that segments of a day as defined by programmers and marketers are called day parts is true.
Day parts refer to specific blocks of time into which a day is divided, commonly used by advertisers and television programmers to target specific audiences. Marketers may identify day parts such as morning, afternoon, prime time, and late night to tailor their advertising to when target demographics are most likely to be watching television or browsing the internet. Similarly, programmers divide the broadcast day into these segments to maximize viewership and cater to different audience preferences.