Which of the following statements is a good guideline in preparing for zero$-$day vulnerabilities? This type of question contains radio buttons and checkboxes for selection of options. Use Tab for navigation and Enter or space to select the option. option A Common industry$-$recommended security controls can mitigate the risk associated with zero$-$day attacks. option B Since zero$-$day attacks are unexpected, they threaten all assets equally. option C A zero$-$day vulnerability might already have been patched by the vendor. option D Zero$-$day vulnerabilities can be exploited by only external threat$-$actors.