How are the senate leaders chosen?

they are appointed by the president of the senate.
they are elected within each party.
they are elected by the whole senate.
they are appointed by the president pro tempore.

1) both gandhiji and bhagat singh believed in ‘inquilab’. however, both of them differed in their strategy to bring about ‘inquilab’. find out a. what does ‘inquilab’ mean? b. what was the strategy followed by the two leaders in bringing about ‘inquilab’? answer it quickly pls