Which DOES NOT fit in the following list?

Which type of media allows advertisers to target a specific audience and get a message to that audience quickly?

a) Direct mail advertising b) Outdoor advertising c) Point-of-purchase advertising d) Online advertising

Tensions between in-groups and out-groups in the workplace:

a.  can be worked out by stressing the groups' shared goals in the company.   b.  are fairly rare and usually work themselves out.   c.  are generally petty and not detrimental to the company as a whole.   d.  should be contained within departments so they don't affect the entire organization.