TheKnot.com is an Internet company that is a one$-$stop source of all the items needed for a successful, customized wedding. Included on the website are listings of local caterers, DJs$,$ florists, and photographers. It also offers advice on what to do about $$cold feet,$$ how to handle in$-$laws, proper etiquette around seating arrangements, how to project manage the events leading up to the big event, and even how to tastefully thank your guest. What are all the information and ideas offered by TheKnot.com considered to be$?$

a$.$ its service mix

b$.$ its offering grouping

c$.$ its assembly process

d$.$ its component combination