1. The problem is to decode the string "4XG=" which appears to be Base64 encoded. 2. Base64 encoding is a method to encode binary data into ASCII characters. The "=" sign is used as padding. 3. To decode, we convert the Base64 string back to its original form. 4. Decoding "4XG=" from Base64 results in the bytes corresponding to the characters: . 5. These bytes may not correspond to readable ASCII characters, indicating the original data might be binary or non-text. Final answer: The Base64 string "4XG=" decodes to the byte sequence with hexadecimal values 0E 17 18.