Use the dictionary entry below to answer the question.
harbor /har-ber/
1. noun a body of water deep enough for anchoring a ship
2. noun a body of water having docks or port facilities
3. verb to give shelter to
4. verb to conceal or hide
5. verb to keep or hold in the mind; to maintain

Which definition of "harbor" is used in the sentence below?
When news of the impending tropical storm broke, many commercial cargo ships nearing the coast sought refuge in the closest harbors they coul quickly reach.
a. 1
b. 3
c. 4
d. 5