The Marriott Corporation is in the following businesses, among others:

hotels of different types
long stay residential hotels
luxury resorts
time share properties
airline catering
institutional food services
franchised operations
credit card tie-ins
travel operations
Given the above listing, would you say that Marriott’s business lineup reflects a strategy of related or unrelated diversification? Explain your answer in terms of the extent to which the value chains of Marriott's different businesses seem to have competitively valuable cross-business relationships.