Given the following database schema:

Product$($makerid$,$ maker, type$)$

PC$($model$,$ speed, ram, hd$,$ price, makerid$)$

Laptop $($model$,$ speed, ram, hd$,$ screen, price, makerid$)$

Printer$($model$,$ color, type, price, makerid$)$

what is the relational algebra operation that retieve the model numbers of all color laser printers?

Select one:

a$.$

b$.$

c$.$

d$.$