How can you overwrite the default input format?

A. In order to overwrite default input format, the Hadoop administrator has to change default settings in config file.
B. In order to overwrite default input format, a developer has to set new input format on job config before submitting the job to a cluster.
C. The default input format is controlled by each individual mapper and each line needs to be parsed indivudually.
D. None of these answers are correct.

Answer: B