Marina Lyon works as a reservation executive at a travel and tourism company. Though her job requires her only to efficiently book flight tickets for customers, she has also opted to undergo training to learn the process of hotel reservations. In addition, every evening she reads travelogues to be aware of upcoming travel destinations and trends. She loves the industry she works in and is eager to learn as much as she can. Considering the information given in this case, which dimension of the Big Five model best describes Lyon's personality?