The product and service offered couldn't be better...

The product and service offered couldn't be better. Carolina is one of the most professional people I've ever worked with. Even answered my emails on Sundays.
The product and service they offer could not be better. Carolina is one of the most professional people I've worked with. Even on Sundays I answered my emails.
The product and service that could not be better. Carolina is one of the most professional people with whom she works. Hasta los domingo's answered my emails.