What Action Is Performed by the Turing Machine Described Below

Multiple Choice

What action is performed by the Turing machine described below?

A) It replaces any string of consecutive 1s to the left of an * with 0s.
B) It leaves the tape unchanged.
C) It places an * at the left end of any string of consecutive 1s appearing to the left of an *.
D) It complements the string of 0s and 1s appearing to the left of an *.