Which one of the following irrelevalent?

The correct answer is (d), SAPS.

Sensex is a stock market index of 30 companies listed on the Bombay Stock Exchange (BSE). It is the most widely used indicator of the performance of the Indian stock market.

BSE is the oldest stock exchange in Asia and the second oldest in the world. It is located in Mumbai, India.

Nifty is a stock market index of 50 companies listed on the National Stock Exchange of India (NSE). It is the second most widely used indicator of the performance of the Indian stock market.

SAPS is a software application that is used to manage human resources. It is not a stock market index and is therefore irrelevant to the question.