What is a significant difference between host and zone keys generated by dnssec-keygen?
A. There is no difference.
B. Both zone key files ( .key/.private ) contain a public and private key.
C. Both host keys files ( .key/. private) contain a public and private key.
D. Host Keys must always be generated if DNSSEC is used; zone keys are optional
E. Zone Keys must always be generated if is used; host keys are optional