Question: In 3GPP security specifications, how are data variables typically presented in terms of significance and substring ordering?
Option 1: Least significant substring on the left, with numbering starting from 1 for the most significant substring.
Option 2: Most significant substring on the left, with numbering starting from 0 for the leftmost substring.
Option 3: Significance and ordering are determined by the specific security protocol in use.
Option 4: Least significant substring on the right, but only for variables broken down into bytes.
Explanation: This is correct because data variables are consistently presented with their most significant parts first (on the left), and when divided into substrings, these are numbered sequentially starting from 0 for clarity and consistency across specifications, aiding in avoiding confusion when interpreting variable structures, especially in security contexts where precision is paramount.