An example of an interface into a payroll system is a(n):

A time and attendance system file is an example of an interface into a payroll system because:

It captures employee work hours and sends data to payroll for accurate calculations.

Payroll interfaces ensure automated and accurate payment processing.

Other options explained:

Check print file (A) is an output, not an interface.

ACH payment file (B) is used to process payments, not interface data.

General ledger transactions (D) are accounting-related, not payroll input.

Reference:

Payroll System Integration Guide (Payroll.org)