General and application control

XYZ company installed a computer system to handle its main accounting functions including accounts receivable, accounts payable and payroll. Management has a number of concems about access to the system and are considering a number of controls to overcome those concerns.
1. Is each of the following a general control or an application control?
O General control
Application control
Locking the computer room to prevent access to non-employees
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O General control
O Application control
Limiting access to the payroll system by making it password protected
General control
Application control
Taking backup of data files each evening and holding backup copies off-premises
O General control
O Application control
Providing basic IT training to the entire staff to prevent errors in using the system

Sir , I am confused between second and fourth statement. Can you please clarify ?