The traditional view of cnidarians relative to germ layers is that cnidaria possess

A)only one germ layer,the ectoderm,that differentiates into the two tissue layers.
B)two germ layers,ectoderm and mesoderm.
C)two germ layers,endoderm and mesoderm.
D)two germ layers,ectoderm and endoderm.
E)definitely all three germ layers including the mesoglea as it is derived from ectoderm.