Answer: Slot

In Amazon Lex, **slots** are used to extract specific pieces of information from user utterances. In this case, "tomorrow" is a date-related value that needs to be captured as input for processing the appointment booking. - **Intent**: Represents the overall goal or action the user wants to perform (e.g., "BookAppointment") - **Slot**: Captures specific data points like dates, names, locations, etc. - **Lambda Function**: Used for additional processing logic - **Alias**: Used for version management of bots The correct answer is **B) Slot** because slots are specifically designed to extract and process variable inputs like dates, names, and other parameters from user messages.

Author: Ritesh Yadav