C is correct
Man dig
-t type
This option indicates the resource record type to query, which can be any valid query type. If it is a resource record type supported in BIND 9, it can be given by the type mnemonic (such as NS or AAAA). The default query type is A, unless the -x option is supplied to indicate a reverse lookup. A zone transfer can be requested by specifying a type of AXFR. When an incremental zone transfer (IXFR) is required , set the type to ixfr=N. The incremental zone transfer contains all changes made to the zone since the serial number in the zone's SOA record was N. All resource record types can be expressed as TYPEnn, where nn is the number of the type. If the resource record type is not supported in BIND 9, the result is displayed as described in RFC 3597.
use the @ Google to respond to query...
then I found out after a long research that:
dig @8.8.8.8 -t NS www.example.com
gives that exactly what in the picture
The local caching resolver seams to gives another answear. Tricky question.
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yigido
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