Zero-Trust Networks is a security concept that assumes that all devices, users, and networks are untrusted until they can be verified. This means that all network-connected devices must be verified for their identity and integrity before they are granted access to resources. This is done continually, meaning that devices are verified every time they try to access a resource, rather than being trusted permanently.

C. Network connected devices should only be trusted if their identity and integrity can be verified continually. This is the main concept of Zero-Trust Networks, every device that wants to access the network should be authenticated and verified its identity and integrity.

References:

Zero Trust Networks, Forrester Research https://www.forrester.com/report/Zero+Trust+Networks/-/E-RES146810

Zero Trust Security: From Theory to Practice, NIST https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800