Which configuration would make an IP SLA probe use a precedence value of 5?()
A、ip sla 1 icmp-echo 1.1.1.1 tos 160
B、ip sla 1 icmp-echo 1.1.1.1 tos 20
C、ip sla 1 icmp-echo 1.1.1.1 precedence 5
D、ip sla 1 icmp-echo 1.1.1.1 dscp 20