INSTALLED :

Answer: Option E

Prepared :make (something) ready for use or consideration.
Settled :resolve or reach an agreement about.
Started :begin or be reckoned from a particular point in time or space, come into being.
Manufactured :Manufactured.
Established :having existed or done something for a long time and therefore recognized and generally accepted.
Installed :place or fix (equipment or machinery) in position ready for use.

Synonym of Installed is Established.