A website manager is deciding what color background to make the landing page of her company's website. During a week-long period, one-third of visitors see a blue background, one-third see a green background, and one-third see a black background. At the end of the week, the website manager tests if there are significant differences among the different colored websites in how long users engage with the website and how many users sign up for their newsletter. This is an example of: Question options:

Cookies

A/B/C testing

Bounce rate

Conversion