单项选择题 Bob, a user, reports that his computer is running slower since he viewed an online training presentation. Bob is also receiving an increased amount of spam email. Which of the following is the MOST likely cause of Bob’s issue?（）

单项选择题 Which of the following terms describes files and folders in sub-directories having the samepermissions as the root or parent directory?（）

单项选择题 Which of the following groups should staff accounts be placed in, if the staff is required to perform most but not all maintenance tasks on a Windows PC?（）