I've tried with a,b,c,d the anchoring of my labels doesn't not line up at all with the widget parent.
A simple case is having a sprite background, and a label on top. Setting the anchor to centre puts the image off to the far side, or sometimes the middle of the screen (yes the widget is set). Tried with many different shapes / anchor types, maybe the changes in anchoring in 3.0 is more than I thought. But I'd think if I anchor Widget A to Widget B and tell it to be 'right' it would neighbor up (setting the pivots correctly of course). Or even have it center pivot, and then center within the other widget. I'm just not seeing those results, leaving me to hand position everything, which is hard when supporting XXTeen resolutions for mobile.