Mackenzie has decided to purchase a new laptop computer and is reviewing Internet-related posts and reading articles about which computers are considered the best. She's not very tech savvy and just needs a basic computer, but she wants it to last three to four years and to be maintenance-free. Mackenzie also visits Best Buy and chats with salespeople to get their advice about which computer model would be best for her to buy. Mackenzie's behavior can be explained by the concept of ______ involvement.