Yuri Agrees to Zed

Multiple Choice

Yuri agrees to zed.com's terms of service and downloads the site's app. Yuri then reverse-engineers the app to create a competing product. This is

A) within the rights of a contracting party.
B) a fair use of the app, with or without a contract.
C) acceptable as long as the site's owners are unaware of the activity.
D) a breach of contract.