Which SPF record is valid for mycompany.com?

Refer to the exhibit.

Which SPF record is valid for mycompany.com?
A . v=spf1 a mx ip4:199.209.31.2 -all
B . v=spf1 a mx ip4:10.1.10.23 -all
C . v=spf1 a mx ip4:199.209.31.21 -all
D . v=spf1 a mx ip4:172.16.18.230 -all

View Answer

Answer: D