Which of the following accurately describes the differences or similarities between mainstream attack surfaces and specialized threat vectors? Select three.

A. Both are targeted with the same degree of frequency.
B. An MSP is a typical example of a mainstream attack surface.
C. One targets client-based software, the other targets supply chain components.
D. An imposter calling the elderly is exploiting a specialized threat vector.
E. A network is an example of a mainstream attack surface.