If a Turing machine program consists of the following four instructions:
(1,0,1,2,R)
(1,1,0,2,R)
(2,0,0,2,R)
(2,b,b,2,L)
Then the configuration ____ is a halting configuration.
A)... b 1 1 b b b ... (current state = 2, symbol 1 is being read)
B)... b 1 1 b b b ... (current state = 1, symbol 1 is being read)
C)... b 1 0 b b b ... (current state = 1, symbol 0 is being read)
D)... b 1 0 b b b ... (current state = 2, symbol 0 is being read)

Question

Quizplus · Accepted Answer

BThe given Turing machine does not have a specific "halt" instruction, but we can infer a halting configuration as one where no further instructions can apply. For choices A and B, the configurations cannot proceed because there are no instructions for state 2 reading a 1 (as in A) or for state 1 reading a 1 with a move that matches the given instructions (as in B, since the instructions change 1s to 0s and move right, but the configuration does not allow for a next step based on the given instructions).

If a Turing Machine Program Consists of the Following Four