In which of the following circumstances would independence of the audit firm likely not be impaired with respect to the audit client?

Question $19$ options:

The auditor of a public audit client became a controller of the client more than six months before the next audit begun

The audit engagement partner's sister$-$in$-$law works in engineering department in a non$-$management position at the audit client and has no influence over the financial statements

An audit senior purchased an audit client's product online, receiving $$250$ discount due to using a publicly$-$available coupon code

The second and third items above