Final answer:
The congruence equation 455 is congruent to 204 mod 469 is already in its simplest form, indicating that x is congruent to 204 mod 469. Thus, the correct answer is x equals 204 modulo 469.
Step-by-step explanation:
The equation 455≡204 mod 469 can be understood as saying "455 is congruent to 204 modulo 469." This means that 455 and 204 leave the same remainder when divided by 469. To solve this congruence equation, we observe that since 455 is equal to 204 plus some multiple of 469, the equation is already solved, and the value of x that satisfies the congruence is 204. Therefore, the correct answer is: x≡204 mod 469. The other options provided do not satisfy the congruence as x=204 directly corresponds to the given equation.