If I was the CISO for a publicly traded company, the first protection I would implement for my system is antivirus protection. Its will prevents scams, threats and different kinds of other attacks. It is a lot of hackers and others attacks going on today world and I want to prevent that from happening. The second protection I would use is Network Security for example Firewalls. The reason is because it can protect your devices from different software infections that the company issues to the employees. The last protection I would use is data loss prevention. Data loss prevention to me is the most important one and its prevents the exposure of sensitive information outside of an organization. It also save and keep your data safe.