Correct datum callout? 4

[SeasonLee]

Please adv is this right on the datum system construction? there is no intersection from datum feature A and B, is this correct to change the FCF from A|B|C to A|C|B?

Season

 

[greenimi]

So, what exactly would be the correct (functional) callout (appropriate coordinate system) for depicted application?
I see just opinions, but not a straight, clear and concise answer.