What Might Happen If You Do Not Have the Most

What might happen if you do not have the most recent version of a code?

A) Codebooks get dirty in the welding shop and older ones are often hard to read.
B) The agencies offering the code move from time to time and you may not be able to find them if you do not have the current code.
C) Codes change from time to time and not having the current code may mean the weld test you take might not be approved in the new version.
D) Codes have been the same for years and the only value to a new codebook is it may be available on the web as a download and be much cheaper.