Which of the following compounds contain an ester functional group? 
Definitions:
Cybersquatting
The practice of registering domain names, especially those resembling trademarks, with the intent of profiting from them either through their sale or use.
Domain Names
Identifiers for websites, acting as a readable address to help users locate and access them over the internet.
Mass Registration
The process of signing up or registering a large number of people or items simultaneously, often used in context with events, voting, or online services.
License
A formal permission or authorization granted by an authority to carry out specific activities that would be illegal without it, often used for businesses, drivers, or software.
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