The correct answer is D) W. The knot shown in illustration D030DG that is commonly known as the "granny" or "thief's" knot is the W knot. This knot is considered to be an improperly tied version of the square knot, as it is weaker and more prone to slipping compared to a properly tied square knot. The granny knot is often discouraged for critical applications, as it can come undone unexpectedly, which is why it is sometimes referred to as the "thief's knot." The other answer choices, F, M, and R, represent different knot types that are not the granny or thief's knot depicted in the illustration.