What is a valid file name format for a history block dated August 15, 2017?

The file name format A170815_001 is correct because it follows a standardized pattern commonly used in naming files related to dated data. This format begins with a two-digit year (17 for 2017), followed by a two-digit month (08 for August), and then a two-digit day (15 for the 15th of the month). This clear structure allows for easy sorting and identification of the file based on the date it represents.

The suffix _001 indicates that this is likely a series of files or records that pertain to that specific date, which helps in organization, particularly when there are multiple entries for the same day.

The other options, while they include the date, do not conform to the typically preferred arrangement for clarity and consistency in historical data storage.