Which stemming is true about red buoys under the island rule?

Under the "island rule," red buoys indicate the right side of a channel when navigating in the direction of upstream traffic. These buoys are marked with a red color and typically feature a conical or triangular shape. According to this rule, vessels should keep red buoys on their starboard (right) side when traveling upstream. Consequently, when returning downstream, these buoys should be on the port (left) side.