Darlene and her friends get together for lunch after work. While at lunch, the friends discuss what they can do to solve the problem of excessive overtime at work. Which of the following is true?

• Darlene and her friends are engaging in concerted activity since they are discussing how to improve working conditions.
• Darlene and her friends are not engaging in concerted activity because they don't plan to talk to management about the problem.
• Darlene and her friends are not engaging in concerted activity because they are not in a union meeting.
• Darlene and her friends are engaging in concerted activity only if they are union members.