As Shown in the Following Topology, EBGP Runs Between AS100

As shown in the following topology, EBGP runs between AS100, AS200, AS300, and AS400, and peer relationships have been established between them. When AS400 receives a BGP route to the network segment 1.1.1.1/32 from AS100, which of the following is the correct value of the AS_Path attribute?

A) 100,200,300,400
B) 300,200,100
C) 400,300,200,100
D) 100,200,300