Ar 25-1 pertains to:
a. army
b. army reserves
c. army national guard
d. all of the above

All of the above.

Explanation:

Ar 25-1 may be defined as the army information technology that was revised on dated 25 June 2013. The publication title has been changed to army information technology.

The Ar 25-1 can be pertained by the army. The army members and army reserves has the right to pertain the Ar 25-1 technology. The army national guard has the full right to pertains the Ar 25-1. Hence, all the given options are correct.

Thus, the correct answer is option (d).

yeet yeet yeet yeet yeet yeet yeet yeet yeet yeet