Statements: No beach is island. All islands are reefs.

The question contains some statements followed by some conclusions. Decide which of the given conclusions logically follow from the given statements, disregarding commonly known facts.
Statements:
No beach is island.
All islands are reefs.
Conclusions:
I. All beaches are reefs.
II. No beach is a reef.
III. Some reefs are islands.
IV. All reefs are islands.