Which of the following is NOT a pre-built connector available in MuleSoft Composer?

The answer indicating that Amazon Web Services is not a pre-built connector available in MuleSoft Composer is correct because MuleSoft Composer offers connectors designed specifically for ease of integration between various cloud applications and services. While Salesforce, Slack, and Google Sheets are among the connectors provided in MuleSoft Composer, allowing users to create flows that interact with these popular platforms seamlessly, Amazon Web Services is typically not listed as a pre-built option.

This aligns with the focus of MuleSoft Composer, which aims at streamlining integrations for less technical users, enabling them to connect apps like Salesforce, Slack, and Google Sheets without extensive coding. AWS, while a powerful cloud platform, tends to require more complex integration patterns that are generally covered in deeper MuleSoft offerings rather than being a pre-built connector in Composer.

Therefore, recognizing which connectors are categorized as pre-built is essential, and in this case, AWS does not fit into the Composer ecosystem as directly as the other listed platforms do.