What is the maximum frequency for giving out a free sub card to a customer?

The maximum frequency for giving out a free sub card to a customer is only once in their lifetime. This policy is likely in place to control the distribution of promotional items and ensure that they do not lose value through over-distribution. By allowing only a single card per customer, the company can maintain the intended exclusivity of the offer and encourage customer engagement without an overwhelming influx of rewards that could affect profitability and customer reward perception.

The other options suggest more frequent distribution, which would not align with this typical policy aimed at sustaining value and customer interest over time.