The correct answer is option 4. The most important feature of the Indian Parliament is that the Upper House of the Parliament is never dissolved. This means that the Rajya Sabha, which is the Upper House, does not get dissolved at the same time as the Lok Sabha, which is the Lower House. The Lok Sabha, however, gets dissolved after every five years or in case of early elections. The Rajya Sabha is a permanent house and only one-third of its members retire every two years, allowing for a continuous presence of experienced members. This ensures a certain level of stability and continuity in the Indian Parliament. Moreover, the Rajya Sabha plays an important role in representing the states and protecting their interests, as its members are elected by the state legislatures.