Выберите, какой вопрос к выделенным словам является верным.
In marketing, the length
of time that people continue to buy a particular product is called the product lifetime.

In marketing, how do we call the length of time that people continue to buy a particular product?
In marketing, how long does the product lifetime last?
In marketing, what is called the product lifetime?
In which area is this term the product lifetime used?

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Выберите, какой вопрос к выделенным словам является верным.In marketing, the lengthof time that people continue to buy a particular product is called the product lifetime.