In United States v. O'Brien, 391 US 367 (1968), and later in Clark v. Community for Creative Non-Violence, 468 U.S. 288 (1984), the SCOTUS gave us what test for "content-neutral" regulationsnow often cited in both outdoor protest situations and digital content regulation and social media?

a.incitement

b.time, place, manner

c.least restrictive means

d.freedom of the press

e.news reporter's shield rule

f.both c and d