a) to persist data in a file

b) to avoid the overhead of accessing the object from database

c) to send the object between servers in cluster.

(a) and (c) are uses of serialization. I don't know if I'd call them "advantages".

(b) sounds like technobabble. Serialization makes object storage in a database possible, not unnecessary.

a) to persist data in a file

b) to avoid the overhead of accessing the object from database

c) to send the object between servers in cluster.