Final answer:
Based on Rebecca's interest and skills, 3) Engineering would be the most appropriate specialized IT focus for her. Hence, option 3) is correct.
Step-by-step explanation:
Based on Rebecca's interest in taking things apart and putting them back together, and her ability to build her own computer from scratch, the most appropriate IT education focus for her would be Engineering. Engineering focuses on designing and creating systems, components, and processes to meet desired needs.
Rebecca can use her problem-solving skills and creativity in this field to continuously improve the capabilities of technology and find innovative solutions. By pursuing Engineering, she can further enhance her skills and knowledge in areas such as hardware development, system architecture, and network design.