How Does Lymph Differ Between Closed and Open Circulatory Systems

Multiple Choice

How does lymph differ between closed and open circulatory systems?

A) In a closed system,lymph is always inside of vessels,whereas in an open system,lymph can escape.
B) In a closed system,lymph travels through a set of vessels separate from blood,whereas in an open system,they never separate.
C) In an open system,all the white blood cells are located in lymph only,whereas in a closed system,they are located in blood only.
D) All of the above answers are true concerning lymph.