This is less of a puzzle and more of a challenge. Originally just going to be the last dataset, I thought that a bit short. So I've included some variations from a geocache puzzle "SIGNAL" by huszarpet - GC78APH.

Nothing fancy, each puzzle simply has some plaintext in each, with the bracketed number showing how many to find.

• A - Don't put all your eggs into one basket (1)
  Hint


• B - I've used this technique far too often at this stage (2)
  Always more than meets the eye.


• C - [Insert witty title here] (1)
  Whoever decided we should limit ourselves to 0 - 255?


• D - . (1)
  Hint