The head of the Information Technology Branch visited a number of departments (Accounts, Marketing, Human...

The head of the Information Technology Branch visited a number of departments (Accounts, Marketing, Human Resources, Public Relations, and Research) to perform server security upgrades. We know the following:
- Accounts was visited before Research.
- Public Relations was visited before Accounts.
- Marketing was visited after Accounts and Research.
- Human Resources was visited after Accounts but before Marketing.
Which of the following statements is NOT necessarily true given the information provided above?
- Public Relations was visited first.
- Marketing was visited last.
- Public Relations was visited before Human Resources.
- Human Resources was visited before Research.
- Research was visited after Public Relations and before Marketing.