R1 executes the operation ping -a 10.1.1.1 10.5.16.2, what does this command mean?

R1 executes the operation ping -a 10.1.1.1 10.5.16.2, what does this command mean?
A . The source IP address of the ping packet is any directly connected port address of R1
B . The source IFP address of the ping packet is the outgoing interface address of the optimal IP route that R1 points to 10.5.16.2, and is not 10.1.1.1
C . The source IP address of the ping packet is 10.1.1.1
D . The destination IP address of the ping packet is 10.1.1.1 and 10.5.16.2

Answer: C