Which structure is not possible?

Question

Quizplus · Accepted Answer

According to UUID (Universally Unique Identifier) standards, each hexadecimal digit can have 16 possible values (0-9 and A-F). The 13th digit (from left to right) can only have certain values, based on the version of the UUID. In version 4 UUIDs, like the ones shown here, the 13th digit must be either 4, 5, 6, or 7. Option C has the value of e8e1 for the 13th and 14th digits, which is not within the acceptable range for a version 4 UUID. Therefore, option C is not a possible structure.

Which Structure Is Not Possible