Which format specifier is used to represent the time of day?

The format specifier for representing the time of day is indeed %T. This specifier is commonly used in programming and data formatting to output the current time in a digital clock format (HH:MM:SS). It is especially useful when you need to display or log time information in a clear and standard way.

The other options refer to different pieces of date and time formatting. For instance, %B represents the full month name, %d is used for the day of the month (01 to 31), and %Y denotes the four-digit year. These format specifiers serve specific purposes in formatting dates and times, but only %T provides the complete time representation. Thus, %T is the correct choice for expressing the time of day.