In the String Theory of Edward Witten

Multiple Choice

In the string theory of Edward Witten:

A) there are 11 dimensions, including two time dimensions (essentially "forward" and "backward") .
B) all of the dimensions are coiled up tightly like coiled strings.
C) the 11 dimensions include several dimensions that ought to be observable at very low temperatures.
D) seven dimensions are coiled tightly like coiled strings.