What cup that Cambridge United will participate in is called the Carabao Cup for sponsorship reasons?
2017–18 Cambridge United F.C. season:  Along with League Two, the club will also participate in the FA Cup, EFL Cup and EFL Trophy. EFL Cup: The EFL Cup (referred to historically, and colloquially, as simply the League Cup), currently known as the Carabao Cup for sponsorship reasons, is an annual knockout football competition in men's domestic English football.
EFL Cup