Consider the following statements with reference to double membership of the Parliament:

1. A person elected to both the Houses of Parliament must intimate within 10 days in which House she desires to serve or her seat in Rajya Sabha becomes vacant.

2. A sitting member of one House if elected to another House, his/her seat in the first House becomes vacant.

3. A person elected to two seats in a House must exercise her option for one, otherwise, both seats become vacant.

How many of the above statements are correct?