What is the relationship between 'Boston Pizza' and 'restaurant' in the context of the input sentence.
Options: owned by, platform, product/material produced, developer

Negative same restaurant sales results for the quarter were principally due to declines in restaurant guest traffic and the temporary closure of all dining rooms and sports bars in Boston Pizza restaurants across Canada, starting on March 17, 2020, both as a result of the COVID pandemic.
product/material produced