Comprehensive and Detailed Explanation:
A payroll system upgrade affects documentation related to payroll processing but does not change union contracts.
Option A (User manuals): Correct - New system features require updated manuals for payroll staff.
Option C (Business continuity plans): Correct - System changes must be included in disaster recovery plans.
Option D (Standard operating procedures - SOPs): Correct - Payroll procedures need updates for new workflows.
However, union contracts (Option B) remain unchanged unless a new agreement is negotiated.
Reference:
Payroll.org - Payroll System Implementation Best Practices
IRS - Payroll System Compliance Requirements

Comprehensive and Detailed Explanation:
Under Fair Labor Standards Act (FLSA) rounding rules, employers may round employee time to the nearest 15-minute increment using the 7-minute rule:
If an employee clocks in before the 7-minute mark, round down.
If an employee clocks in after the 7-minute mark, round up.
Employee's actual times:
Clock in: 8:07 a.m. → Rounded down to 8:00 a.m.
Clock out: 4:08 p.m. → Rounded up to 4:15 p.m.
Thus, the correct answer is D. 8:00 a.m. to 4:15 p.m..
Reference:
DOL - FLSA Rounding Rules for Payroll Timekeeping
Payroll.org - Timekeeping Compliance Best Practices

Independent contractors DO NOT complete Form I-9, as they are not employees under IRCA (Immigration Reform and Control Act).
Employees receive Form W-2 and complete Form W-4.
Independent contractors complete Form W-9 for tax reporting.
Reference:
IRS Independent Contractor Guidelines (Publication 1779)