Answer:
Roger will have the most success getting information out quickly in an "Email" and by posting the information on the company’s "Message Board".
Step-by-step explanation:
An intranet is a private network owned by a company and used to share company information. It can only be accessed by members of that company.
A "message board" is a section of a website where people discuss by posting messages and comments.
Since all employees in Roger's company have company email addresses and access to the intranet, then the best way for Roger to send out the information will be through an "email" and a post on the company's "message board".