What Are Trujillo Et Al's (2009) Two Proposed Recruitment Pathways

What are Trujillo et al's (2009) two proposed recruitment pathways to terrorist activity?

A) attraction to extremist activity by a charismatic leader or mentor and recruitment through friends and family
B) recruitment through friends and family and self-recruitment
C) recruitment through friends and family and online recruitment
D) self-recruitment and attraction to extremist activity by a charismatic leader or mentor