You have three switches with LAN Base and two switches with IP Base features sets. You want to stack the switches together. What needs to be done?

A. Upgrade the three switches from LAN Base to IP Base.
B. Downgrade the two switches from IP Base to LAN base.
C. The switch stack will upgrade or downgrade the IOS according to the master switch.
D. All of the above

C. When you create a switch stack, the subordinate switches will upgrade or downgrade the IOS software according to the master switch’s IOS. Legally, you must purchase the highest IOS the master switch contains or downgrade the license the master contains.