A is fine. We can tweak the text to fit our situation rather than making the process fit the current text.
We should say what we want to convey without referencing the word "supported" anywhere which is a phrase we should avoid when it's ambiguous. Something like: "A new version of Plasma <%= plasma %> is available, which may have already addressed your current issue. Only critical and security fixes will be backported to this release. Blah blah blah, please upgrade"
