Which of the following statements is most accurate?

Cell-based organizational arrangements among violent extremists proliferated in the aftermath of the September 11, 2001 attacks. Paramilitary organizational arrangements among violent extremists proliferated with the breakdown of authoritarian regimes in the Middle East and elsewhere. Most violent extremists engage in lone-wolf attacks. Both “cell-based organizational arrangements among violent extremists proliferated in the aftermath of the September 11, 2001 attacks” and “paramilitary organizational arrangements among violent extremists proliferated with the breakdown of authoritarian regimes in the Middle East and elsewhere.”