Choose the option that is the passive form of the given sentence.
The custodian of the library showed us some books on ancient India.
1
Some books on ancient India are shown to us by the custodian of the library.
2
Some books on ancient India is showed to us by the custodian of the library.
3
Some books on ancient India was shown to us by the custodian of the library.
4
Some books on ancient India were shown to us by the custodian of the library.