Which statement describes valid Stop IDs for MRLs?

Which statement describes valid Stop IDs for MRLs?

• A. MRLs may only be made out of valid I-Type Stop IDs or F-Type Stop IDs.
• B. MRLs may only be made out of L-Type Stop IDs.
• C. MRLs can use any Stop IDs.
• D. MRLs do not use Stop IDs.

Answer: (A)

MRLs must be built from Stop IDs that meet the official classifications. Only Stop IDs of the I-Type and the F-Type are recognized as valid for MRLs. This keeps the data consistent and verifiable, since those two types conform to the required formats and rules defined in the spec. Using any other type, such as L-Type, would fail the validation because it isn’t defined as a valid component for MRLs, and claiming that any Stop IDs are acceptable ignores the necessary format checks. Similarly, saying Stop IDs aren’t used would contradict the requirement to anchor MRLs to these standardized IDs.

MRLs must be built from Stop IDs that meet the official classifications. Only Stop IDs of the I-Type and the F-Type are recognized as valid for MRLs. This keeps the data consistent and verifiable, since those two types conform to the required formats and rules defined in the spec. Using any other type, such as L-Type, would fail the validation because it isn’t defined as a valid component for MRLs, and claiming that any Stop IDs are acceptable ignores the necessary format checks. Similarly, saying Stop IDs aren’t used would contradict the requirement to anchor MRLs to these standardized IDs.