Which of the Following Is LEAST Likely to Fall Under

Which of the following is LEAST likely to fall under the legal definition of picketing?

A) a single striking employee waiving a placard with the intent to secure a sympathetic response from an audience of onlookers
B) a group of striking employees waving placards with the intent to secure a sympathetic response from an audience of onlookers
C) a group of striking employees posting messages on a company-only discussion board on the Internet
D) a group of striking employees having a sit-in on the front steps of the workplace, engaging in discussion about the workplace issues with those who approach
E) blockading the employer's premises with cement barricades, with signs posted to them regarding the strike.