Using the same datasets in$$Addressing Business Questions in R$,$ write SQL commands that$$

$($a$)$ return the delayed orders. Your query must return order numbers only.$(1$ point$)$

$($b$)$ return the customers in the North region, where their orders are delayed. Your query must return the customers only avoiding duplicated names.$$You may use unique$()$function to avoid any duplications.$(1$ point$)$

$($c$)$ return the$$most profitable customers, service pricing is $$7500$ and more,$$in East or North. Your query must return the customers only avoiding duplicated names.$$You may use unique$()$function to avoid any duplications.$(1$ point$)$