Final answer:
No Doppler shift will occur when the source and the observer are stationary relative to each other.
Step-by-step explanation:
The scenario that will produce no Doppler shift to the receiver is the one where the source and observer are stationary relative to each other. In this case, there is no relative motion between the source and the observer that would cause a change in frequency. For example, when people talk when a wind moves the air between them, they observe no Doppler shift in their conversation. The same principle applies when both the source and the observer are stationary.