For each of the following, indicate if there is a threat to independence. If so$,$ state the threat and a possible safeguard.

a$)$ Olivia Dazzle has been auditing Fancy Dance Studio for many years. Fancy Dance Studio $.$ has been experiencing financial difficulties and has not been able to pay its audit fees for the last three years. Fancy now owes Olivia Dazzle $$50,000$ in assurance fees.

b$)$ Robert Razo has three review engagements. One of the review engagements is done for Hugo's Meat shop Ltd$.,$ which is $80\%$ owned by Robert's father$-$in$-$law, Igor Slovlom.

The remaining $20\%$ of the Meat shop is owned by Igor's four children.