Explanation:

The only condition for the initiation of impeachment of Indian president is the ‘violation of the constitution.’ We have taken Lok Sabha as the first house to initiate the impeachment charges, however, Rajya Sabha too can initiate the impeachment charges against President and in that case, it will pass the resolution and send the charges to Lok Sabha which will investigate and pass it if it finds those charges valid. Hence option 2nd is correct.
Note: Indian Constitution contains no definition of ‘violation of constitution.’