An employee of a company received an email about the company's salary adjustment and saved the email attachment. A few days later, the company administrator discovered that most of the company's…

An employee of a company received an email about the company's salary adjustment and saved the email attachment. A few days later, the company administrator discovered that most of the company's employees' computers were infected with viruses and could not operate properly. Which of the following attack methods might the hacker use in this case? (Multiple Choice)