Explanation:

Let’s go through each option:

- Option 1: A Prime Minister can be from the Rajya Sabha and does not need to get elected to the Lok Sabha within six months. Only a minister who is not a member of either house must do so within six months, not if they are already from Rajya Sabha.

- Option 2: The Prime Minister can declare government policies in both houses, not just the Rajya Sabha.

- Option 3: He/she cannot vote in a no confidence motion, since only Lok Sabha members can vote on such motions.

- Option 4: The Prime Minister, if a Rajya Sabha member, can participate in Lok Sabha budget discussions, but cannot vote.

So, the correct answer is Option 3.