You are waiting on a customer at the counter, the phone rings
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Do you let the call go to voice mail?
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Do you answer the call?
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Do you ignore the phone and wait on the customer at the counter?
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Do you ignore the customer at the counter and answer the phone?
Let the call go to voicemail and continue serving the customer in front of you. The in-person customer should take priority over someone calling in, as they've already made the effort to come to your location. This follows standard customer service etiquette.
This is a customer-service etiquette/scenario question rather than a hard fact: standard best practice in retail/service roles is to prioritize the customer physically present at the counter and let an incoming phone call go to voicemail rather than interrupting face-to-face service. This reflects common customer-service training guidance (in-person customers generally take priority over calls), which is why that option is marked correct. It's a judgment-based 'best practice' answer rather than an objectively provable fact, so reasonable people/trainers could argue for context-dependent answers.