Calcium Clarification

I understand the basic table we use, which I'm copying here.  But here's my question . . . what about when it says Calcium (as Calcium Citrate).  Is that "A," "B" or "C" below?  I'm assuming B, but I want to be sure.

Example A: Elemental Calcium: 315mg

This means there is 315mg of calcium per tablet.

Example B: Calcium (Citrate): 500mg

When the source of calcium appears in parentheses it means the amount of calcium listed is elemental calcium, so in this example you are receiving 500mg of calcium.

Example C: Calcium Citrate: 500mg

When the source does not appear in parentheses, the 500mg is not elemental calcium. Since calcium citrate is 21% calcium you would actually only be receiving 105mg of calcium in this example.

I've seen something recently on the Facebook group, I think. I'll look around for it.

--g