Kalaki subscribes to an online computer digest. Kalaki notices a string of characters with a message next to a link that reads"... use to verify file integrity after downloading." What does the string of characters represent? Select four.

a$.$ A hash

b$.$ A dynamic OTP

c$.$ A message digest

d$.$ A digital fingerprint

e$.$ The key to decrypt the file

f$.$ The result of a one$-$way algorithm