Read this and answer the question. If the question is unanswerable, say "unanswerable".

Companies with limited resources may choose to engage in only a few of these activities, while larger organizations may employ a full spectrum of communications. Since it is difficult to develop such a broad range of skills, communications professionals often specialize in one or two of these areas but usually have at least a working knowledge of most of them. By far, the most important qualifications communications professionals can possess are excellent writing ability, good 'people' skills, and the capacity to think critically and strategically.

Besides excellent writing abilities and good 'people' skills, all company employees should  have what other skill?
unanswerable