When considering Apex callouts, which of the following is true regarding the limit on API calls?

The choice indicating that API limits are shared with all integrations is correct because, in Salesforce, the total number of API calls made is a pooled limit across all integrations, applications, and users accessing the Salesforce instance. This means that any API call made by any part of the system counts against the same limit, regardless of whether the call is from a third-party application, an internal integration, or a user-initiated process.

Understanding that the API limits are shared helps to highlight the need for careful management of API calls, especially in environments with multiple integrations that may be competing for the same resource. It also underlines the importance of monitoring usage patterns to avoid hitting the API limit unexpectedly, which could disrupt services relying on API interactions.

Other options do not accurately represent how API limits function. For instance, limits do indeed reset every 24 hours, but this fact alone does not encompass the shared nature of those limits. The notion that limits can exceed during emergencies is misleading—exceeding the limit would still result in failures regardless of circumstances unless specifically defined exceptions are made, which is not a standard practice. Lastly, API limits pertain to both inbound and outbound calls; therefore, stating they only apply to inbound calls is incorrect.