What is the relationship between 'PayPal' and 'credit card' in the context of the input sentence.
Options: subsidiary, parent organization, currency, product/material produced

Square’s business model is also deployed by late-arriving rivals PayPal Holdings Inc. PYPL, -1.65% and Intuit Inc. INTU, -1.58% both of which now offer credit card readers for mobile devices.
product/material produced