How would this glossed sentence best be interpreted into English?

P-T-A MEETING START WHEN? 5:00 EXACT!

Responses

The P.T.A meeting starts at 5:00 exact.

The P.T.A. meeting starts at 5:00 sharp.

The P.T.A meeting starts when? 5:00 exact.

The P.T.A meeting starts when? 5:00 sharp.

The P.T.A meeting starts at 5:00 sharp.