Which sentence conforms to AP style?

/in /by

Which sentence conforms to AP style?

1)Police said that, at about 9:30 PM, two men wearing masks entered and robbed a convenience store on Griffin Road.

2)Police said that, at about 9:30 P.M., two men wearing masks entered and robbed a convenience store on Griffin Road.

3)Police said that, at about 9:30 pm, two men wearing masks entered and robbed a convenience store on Griffin Road.

4)Police said that, at about 9:30 p.m., two men wearing masks entered and robbed a convenience store on Griffin Road.