Which type of test category describes this test?

developer removes the HTML class attribute from the checkout button, so now it is simply:

<button>Checkout</button>.

There is a test to verify the existence of the checkout button, however it looks for a button with class= “blue”. The test fails because no such button is found.

Which type of test category describes this test?
A . True positive
B . True negative
C . False positive
D . False negative

Answer: D