What practical techniques can be used to exploit the weaknesses of the substitution cipher? $($Select all that apply$)$

Group of answer choices

Look at pairs, triples, or quadruples of ciphertext symbols to detect patterns.

Determine the frequency of every ciphertext letter.

Analyze the internal structure of the cipher.

Identify frequent short words like $$THE$$ or $$AND$$ in the ciphertext.

Use a brute$-$force attack to test all possible keys.