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To schedule field service appointments using an external REST API within OmniScript, utilizing the correct elements is crucial for seamless integration and functionality. The three essential elements that support this task include the HTTP Action, which is necessary for making service calls to an external API, as it facilitates data exchange between the OmniScript and the field service appointment system.
The other elements mentioned, such as the Text Block, the Text Area, and the Select, serve different functions within OmniScript. While a Text Block is used for displaying static information, a Text Area is meant for user input of larger text data. The Select element allows users to choose from a predefined list of options. However, none of these elements directly support the process of scheduling appointments through API calls.
Therefore, the correct choice focuses on the HTTP Action as an integral element to execute those external requests necessary for scheduling appointments within the field service framework.