Read the sentence.

To put the sentence in formal style, which is the best revision to make? Before attempting to undertake a career in the film industry, it's important to investigate the skills and qualifications required, as one should with any job.
O changing "undertake" to "go for"
O changing "it's" to "it is"
O changing "investigate" to "check out"
O changing "job" to "gig"​