What class is this amplifier? A previous answer says class a/b but the description says class D...

It is a Class A B amplifier, definitely not Class D. It likely has a digital switching circuit in there somehow but the outputs sections are old-fashioned boat anchor type. If it was a Class D digital amplifier you'd have all that power and about a quarter of the weight.

im Trying to power 6 speakers in 3 zones in a restaurant. Can this unit play to all zones at the same time or is it only 1 zone at a time powered?

Yes, this unit can play to all zones at the same time.

What class is this amplifier? class a/b, class d?

Hello! This amplifier is class a/b.

I have six different rooms with speakers wired. Can I use this to power and turn on/off rooms? I.e. kitchen and living room on and dining room off?

The six zones, or 12 channels, share a common power supply and turn-on method either manually switched (on the front), auto sensing, or from a 12-volt trigger (hard wired). You can select a common source (1 or 2) or connect an independent source per channel or zone but you are restricted to the turn-on option you select for all. Your best bet would be to use in-wall volume controls.

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🎶 Command your space with sound — anytime, anywhere.

CUSTOMIZABLE LOCAL ACCESS - Enhance convenience with optional in-wall keypads for tactile control without reaching for your device.
TOTAL CONTROL IN YOUR HANDS - Manage volume, sources, and zone grouping effortlessly via the sleek OSD Control App on your smartphone or tablet.
SMART HOME READY INTEGRATION - Plug into your existing automation ecosystem with RS232 compatibility and Control4 driver support.
SEAMLESS MULTI SOURCE PLAYBACK - Stream different audio sources simultaneously or sync zones for a unified sound experience.
IMMERSIVE 6 ZONE AUDIO POWERHOUSE - Deliver crisp, room-filling sound with 80W per channel at 4 ohms—perfect for whole-home or office setups.

The OSD Nero Max12 is a robust 12-channel, 6-zone amplifier delivering 80W per channel at 4 ohms, designed for multi-room audio in homes or light commercial spaces. It supports independent multi-source playback with multiple input options, app-based control for iOS and Android, and smart home integration via RS232 and Control4 drivers. Expandable up to 18 zones and compatible with optional in-wall keypads, it offers flexible, centralized, and local audio management.