Final answer:
option c,The maximum timeout for an External Number node is 90 seconds, which is important for integration with external services that may take time to respond.
Step-by-step explanation:
The maximum timeout for an External Number node is 90 seconds (Option C). When configuring an External Number node, this setting determines how long the system waits for an external service to respond before timing out.
In situations where the external service is expected to take a longer amount of time to process a request or provide a response, understanding and setting an appropriate timeout duration is crucial.
The maximum timeout for an External Number node is 30 seconds.