The correct options are
A He is the ex-officio Chairman of the Rajya Sabha
D If the President resigns or dies, the Vice-President officiates as President
The Vice President of India is the second-highest constitutional office in India, after the President. The Vice President acts as President in the absence of the President due to death, resignation, impeachment, or other situations. The Vice President of India is also the ex-officio Chairperson of the Rajya Sabha, and he is elected by the members of an electoral college consisting of the members of both Houses of Parliament. The minimum age eligibility for a candidate to contest elections for this position is 35 years.