Less popular open source products are not likely to attract the community of users and contributors necessary to help improve these products over time. This situation reiterates the belief that are a key to success.
A. proprietary products
B. brand strategies
C. network effects
D. technology expenses
E. advertising campaigns

C. network effects

Explanation:

The network effect is a phenomenon that explains that the number of users can increase or decrease the value of a system. The best example of the network effect is the internet and E-commerce websites. At first, there were hardly any clients yet with time, the estimation of web expanded because of increase in several clients.

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the business rule that governs the relationship is one-to-many as there are multiple customers for each agent.

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