Which of the following suggest that Christensen's theory of disruptive innovation may explain the failure of Blockbuster?

a$.$

The focus by Blockbuster on to in$-$store cross$-$sales to its regular $($best$)$ customers

b$.$

Recruitment of a new CEO with retail turnaround experience

c$.$

Initially Netflix was a low performing market entrant that could not match the performance of Blockbuster on traditional industry metrics $($e$.$g$.$ availability of latest Hollywood film releases$)$

d$.$

Netflix$/$streaming was just one of the competitive changes faced by the video rental market in the early $2000$s $($e$.$g$.$ supermarket sales, vending machines, Amazon$)$