A spark Dataframe provides better performance because $...$

a$)$ it does not need initialization and it is already initialized when we start up spark system.

b$)$ it includes Data Schema similar to database systems and does not need to create new Objects when adding new data rows so that data serialization is faster.

c$)$ it can keep data in main memory better than Spark RDD$.$

d$)$ it never writes data to disk and always keeps the data in the main memory.