this is true, but the OP was asking about Vo and Va, not Vno. Cirrus have Vo as well, specifically thats also the maximum parachute deployment speed. (however it has been pulled in the past at much faster speeds, some of which failed).

To the Op, honestly, I dont know. I know what Va is, and as one ahs said before its the speed where a stall would occur prior to stuctural failure. Essentially you cannont put enough G's on the aircraft to damage it because you will stall first at and below that speed. As for Vo, i have yet to get a clear answer myself.