Answer: C - Standardization
Explanation: One of the NIMS guiding principle that supports interoperability among multiple organisation is Standardisation.
NIMS consists of a standardised emergency management structure implemented at federal, state and local governments, NGOs and the private sector to respond to demands arising from crisis situations
It fosters interoperability and inter-agency co-operation, providing schemes for management characteristics related to its operations, communication, planning, logistics, finance and administration and intelligence and investigation.
