This article discusses product differentiation within the hotel industry. Based on what the article says, which of the following would be a true statement:

a$.$ horizontal differentiation is a more effective strategy than vertical differentiation when competition intensifies

b$.$ vertical differentiation can allow a company to raise its prices and escape competitive pressure

c$.$ horizontal differentiation can allow a company to raise its prices and escape competitive pressure

d$.$ vertical differentiation is achieved when a company offers a product or service with unique attributes that satisfy a particular customer segment

e$.$ both horizontal differentiation and vertical differentiation give rise to higher prices, but the vertical differentiation strategy is the one associated with the highest prices

f$.$ all of the above

g$.$ answers $a,b$ and c are correct

h$.$ answers b$,$ c and e are correct

i$.$ answers b$,$ c$,$ d and e are correct

j$.$ answers a$,$ b$,$ c and e are correct