A bottleneck is all of these choices are correct.
In the field of business, when a company is not able to handle the workflow, such that it becomes slow or stops completely, then such a phenomenon is referred to as a bottleneck.
A bottleneck might happen because of the small capacity of a resource due to which the entire work process becomes slower.
A resource that is essential for the production of a product might be the leading cause of a bottleneck. This resource plays a primary role in determining the flow rate of the production process.
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