When multiple MX9002m modules are daisy-chained to Top-of-Rack switches, which uplink port can be used for stacking?

When multiple MX9002m modules are daisy-chained to Top-of-Rack switches, which uplink port can be used for stacking?
A . Only the Gb2 port on the primary (left) MX9002
B . Gb1 uplink ports can only stack with other Gb2 ports
C . Either uplink port can be utilized
D . Only the Gb2 port on the secondary (right) MX9002

Answer: C