For each iteration of the DATA step, how many records are read?

In SAS, during each iteration of the DATA step, the number of records read depends on the context of the DATA statement and any specified operations on the datasets involved. The correct choice indicates that during each iteration, a total of three records are processed.

This scenario often arises when there is a specific structure to the data being read. For example, if the DATA step is designed to process multiple records from one or more input datasets simultaneously, this can lead to the reading of multiple records in each iteration.

If the DATA step contains syntax that references multiple input sources or utilizes mechanisms such as arrays or multiple SET statements, it can manipulate or read data in bulk, thereby permitting three records to be processed sequentially within that iteration. This understanding of how the DATA step reads and processes data is crucial when working with multiple iterations or large datasets in SAS.

Being aware of such structures can enhance your ability to manage and manipulate data effectively within the SAS environment, which is vital for efficient data analysis.