Which statements about the CDS market are true?

a. The North America CDX is an index of credit default swap contracts on investment grade names.

b. The ITRAXX is an index of European references.

c. The fixed rates paid by the buyers of credit default swaps are the points plotted on the swap curve, which like the yield curve, plots interest rates against maturity.

d. The ISDA creates the templates for CDS contracts, which may differ in their definitions of a restructuring event.