Appian analyst Practice Excam test question

Dear all can you please help me to understand why in the Appian analyst Practice Excam test question:

What key capabilities of Appian’s unified low-code platform can be used to address common business requirements?  The Answer "Pre-built applications" is a wrong answer?

This capability is also mention in this blog page: appian.com/.../top-7-low-code-capabilities-for-enterprise-businesses

thanks a lot

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