What Action Is Performed by the Turing Machine Described Below

question 48

Multiple Choice

What action is performed by the Turing machine described below?

$\begin{array}{ccccc}\begin{array}{c}\text { Current } \\\underline{\text { state }}\end{array} & \begin{array}{c}\text { Current } \\\underline{\text { cell content }}\end{array} & \begin{array}{c}\text { Value } \\\underline{\text { to write }}\end{array} & \begin{array}{c}\text { Direction } \\\underline{\text { to move }}\end{array} & \begin{array}{c}\text { New } \\\underline{\text { state }}\end{array} \\\text { START } & * & * & \text { left } & \text { X } \\\text { X } & 1 & 0 & \text { left } & \text { X } \\\text { X } & 0 & 0 & \text { right } & \mathrm{Y} \\\text { Y } & 0 & 0 & \text { right } & \text { Y } \\\text { Y } & * & * & \text { no move } & \text { HALT }\end{array}$

• 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 *.

---

Definitions:

External Comparisons

The process of evaluating oneself, one's abilities, achievements, or conditions in relation to others.

Current Performance

The recent or ongoing level of effectiveness and achievement demonstrated by an individual or organization.

Qualitative Forecasting

A forecasting method that uses expert opinions and other non-quantifiable information to predict future events.

Expert Opinion

Advice or evaluation from someone recognized as an authority in a specific field, often used as a credible source of information.