All are prohibited in acceptable use of information assets, except:

The only option that is not prohibited in acceptable use of information assets is C: company-wide e-mails with supervisor/TL permission. This option implies that the sender has obtained the necessary authorization from their supervisor or team leader to send an e-mail to all employees in the organization. This could be done for legitimate business purposes, such as announcing important news, events or updates that are relevant to everyone. However, this option should still be used sparingly and responsibly, as it could cause unnecessary disruption or annoyance to the recipients if abused or misused. The other options are prohibited in acceptable use of information assets, as they could violate the information security policies and procedures of the organization, as well as waste resources and bandwidth. Electronic chain letters (A) are messages that urge recipients to forward them to multiple other people, often with false or misleading claims or promises. They are considered spam and could contain malicious links or attachments that could compromise information security. E-mail copies to non-essential readers (B) are messages that are sent to recipients who do not need to receive them or have no interest in them. They are considered unnecessary and could clutter the inbox and distract the recipients from more important messages. Messages with very large attachments or to a large number of recipients (D) are messages that consume a lot of network resources and could affect the performance or availability of the information systems. They could also exceed the storage capacity or quota limits of the recipients’ mailboxes and cause problems for them. ISO/IEC 27001:2022 requires the organization to implement rules for acceptable use of assets (see clause A.8.1.3). References: CQI & IRCA Certified ISO/IEC 27001:2022 Lead Auditor Training Course, ISO/IEC 27001:2022 Information technology — Security techniques — Information security management systems — Requirements, What is Acceptable Use?