In the given code, each letter of the word is replaced by a symbol or character, followed by a number. To determine the code for `DELAY`, we need to identify the symbol or character used for each letter and the corresponding number.

By comparing the codes given, we can see that the symbol for `D` is `%`, the symbol for `E` is `4`, the symbol for `L` is `@`, the symbol for `A` is `2`, and the symbol for `Y` is `P`.

Now, we can construct the code for `DELAY` using these symbols and the corresponding numbers. The code for `DEL` will be `%4@` and the code for `AY` will be `2P`. Combining these codes, we get `%4@2P`. Therefore, option 4 (%4@2P) is the correct answer.

Therefore, `DELAY` is written in the given code as `%4@2P`.