$($c$)$ Considering the schema above, write relational expressions for the following sentences $[15$ points$]$

Find all customers from $$Kent$$ city.

Find the names of all borrowers with a loan amount greater than $$5000$

Find the names of all depositors who have an account with a balance greater than $$9,000$ at the $$Kent$$ branch.

$($d$)$ What is Cartesian$-$product? Explain its importance in the relational data model. $[10$ points$]$v