Apart from retaining good customers, most marketers want to constantly increase their "share of customer." What does this mean in marketing terms?

Marketers want to increase the share they get of the customer's purchasing in their product categories.

Marketers want to increase their market share.

Marketers want to turn satisfied customers into delighted customers.

Marketers want to continuously increase their customers' levels of satisfaction.

Marketers want to diversify their operations and customize their products to cater to the entire market.