Note that they recommend to maintain at maximum FL230. This is the first info you have to hold.
The second one is to maintain max 5 PSI. As 18-wheeler said, it's to avoid high pressure on the windshield.
The three options you've found in your QRH are advisory information. Depending on your minimum safety altitude, you can choose either. Or even descent to below FL100 and depressurize your acft.