When a SIP message does not contain the “Allow” header, what is the sender telling the receiver about supported SIP methods?

When a SIP message does not contain the “Allow” header, what is the sender telling the receiver about supported SIP methods?
A. The sender does not support any SIP method
B. It is coming from an intermediate SIP entry
C. The sender supports all standard based SIP methods
D. The sender is not providing any information on what method it supports

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