What weaknesses of the affine cipher make it insecure, as mentioned in the text? $($Select all that apply$)$

Group of answer choices

The key space is too large, making it difficult to search exhaustively.

The affine cipher relies on modular arithmetic.

The mapping between plaintext letters and ciphertext letters is fixed.

Letter frequency analysis can easily break the cipher.

The affine cipher is not used in practical cryptography.