Which of the following requirements must be met by a state in drawing congressional district boundaries?

A) A person's vote in the largest district of a state must have only half the value of a person's vote in the smallest district.
B) Districts in a given state must not be geographically compact.
C) Larger districts in a state must have more number of voters than smaller districts.
D) Districts in a given state must have contiguous boundaries.
E) The task of redistricting must always be handled by independent commissions instead of state legislatures.

D