A chemical plan wants to upgrade the Industrial Control System (ICS) to transmit data using...

The greatest impact on security for the network is that the ICS is now accessible from the office network. This means that the ICS is exposed to more potential threats and vulnerabilities from the internet and the office network, such as malware, unauthorized access, data leakage, or denial-of-service attacks. The ICS may also have different security requirements and standards than the office network, such as availability, reliability, and safety. Therefore, connecting the ICS to the office network increases the risk of compromising the confidentiality, integrity, and availability of the ICS and the critical infrastructure it controls. The other options are not as significant as the increased attack surface and complexity of the network. References: Guide to Industrial Control Systems (ICS) Security | NIST, page 2-1; Industrial Control Systems | Cybersecurity and Infrastructure Security Agency, page 1.