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
Which SPF record is valid for mycompany.com?
C