Within the hyperclip description, the variable X is constrained to which domain?

• A. The unit circle
• B. All real numbers R^n
• C. The unit hypercube [0,1]^n
• D. The cube [-1,1]^n

Answer: (C)

The key idea is that X is limited componentwise to the interval from 0 to 1, so every coordinate of X lies in [0,1]. This creates the unit hypercube in n dimensions, [0,1]^n. Such a constraint is common when X represents probabilities or normalized features, ensuring all components are nonnegative and don’t exceed 1.

If X were restricted to a unit circle, that would depend on its length in a plane, which isn’t what a componentwise clip does. Allowing all real numbers removes any bounds, which contradicts the idea of clipping. Bounding to [-1,1]^n would permit negative values, again not matching the described constraint. Therefore, the correct domain is [0,1]^n.