What does TRI stand for in the context of mutual fund benchmarking?

Why is the Total Return Index (TRI) considered more valuable than a regular index chart?

What is the primary factor that influences the returns of an index, regardless of the number of stocks it includes?

According to the text, what should be the primary benchmark for an individual mutual fund investor?

What is the key takeaway regarding the comparison of TRI returns for Nifty 50 and Nifty 500?