Under what conditions does a secondary name server request a zone transfer from a primary name server?

Under what conditions does a secondary name server request a zone transfer from a primary name server?
A . When a primary SOA is higher that a secondary SOA
B. When a secondary SOA is higher that a primary SOA
C. When a primary name server has had its service restarted
D. When a secondary name server has had its service restarted
E. When the TTL falls to zero

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Answer: A