$3$a$)$ Which store that has the most dvds in stock $($non$-$unique$)?$

$3$b$)$ How many does it have?

$3$c$)$ Provide your SQL query for $2$a$-$b

$4$a$)$ Which store has the most unique dvds $($films$)$ in stock?

$4$b$)$ How many does it have?

$4$c$)$ Provide your SQL query for $4$a$-$b

$5$a$)$ Which customer id rented the most dvds on a single day?