When a bill is referred to a joint sitting of both the Houses of the Parliament, it has to be passed by

1. A joint sitting of both the Houses of Parliament is convened by the President under Article 108 of the Constitution to resolve a deadlock between the Lok Sabha and the Rajya Sabha over an ordinary bill. 2. According to Article 108(4), if at the joint sitting the bill is passed by a majority of the total number of members of both Houses present and voting, it shall be deemed to have been passed by both Houses. 3. This constitutes a simple majority of the members present and voting in the combined sitting. 4. Special majorities like three-fourths majority, two-thirds majority of the Houses, or absolute majority of the Houses are not required for passing a bill in a joint sitting. 5. Therefore, option (A) is the correct answer.