Li chang has recently started his own business. he plans to launch his design for an application (app) for a smartphone. all of his direct
competitors have put up their apps to be downloaded (online) for free. he wants to follow the same advertising policy that his competitors are
using. all the apps that are similar to his are available at a common portal. which p of marketing should li chang concentrate on to differentiate
his app?
li chang should concentrate on his
to differentiate his app from those of competitors.

I feel Chang must work hard on the promotion part of the P.

Explanation:

And that requires a very broad range of marketing, and top-quality branding for luring more users to use the app. And the competitors are selling for free and the product is same as well, and he cannot do anything with the place as the competitors have launched their app on play store. Hence, it’s the promotion that is most important, and at large scale as competitors are selling their apps for free. So, Chang need to prove that his app is better through large scale promotion.  

saas delivery model;

what is your question exactly? when you let me know i will gladly you. : )