Question $(3)($a$)$ Consider the relational database of "Employee". Give an expression in the relational algebra to express each of the following queries: $(1)$ Find the names of all employees who live in city "Miami$.(0)$ Find the names of all employees whose salary is greater than $$100,000.($ii$)$ Find the names of all employees who live in $$Miami$"$ and whose salary is greater than $$100,000($b$)$ Consider the following expressions, which use the result of a relational algebra operation as the input to another operation. For each expression, explain in words what the expression does. Assume there are two schemas or relations i$.$e$.$ student and takes $($means student takes courses$).($i$)$ Oyear $22009($takes$)$ student $($ii$)$ Oyear $2009($takes a student$)($iii$)$ Ilid, name, course.jd $($students takes$)$