Select all that apply to the Data Encryption Standard $($DES$)$:

Is an iterated block cipher, which works by repeating the same operation multiple times

Is the archetypal block cipher$-$an algorithm that takes a fixed$-$length string of plaintext bits and transforms it into a ciphertext bitstring of the same length

Because of its weaknesses, some organizations repeat the process three times $(3$DES$)$ for added strength

Is designed to encipher and decipher blocks of data consisting of $64$ bits under control of a $56-$bit key