Discussion
As per ISO-2709 the sequence of elements in bibliographic record structure is :
(a) Directory
(b) Data fields
(c) Record label
(d) Record separator
Answer: B
The sequence is (c) (a) (b) (d): record label, directory, data fields, record separator.
ISO 2709, the exchange format on which MARC records are built, structures a record as a fixed-length record label (leader) of 24 characters, then a directory listing each field's tag, length and starting position, then the variable data fields themselves, and finally a record separator marking the end of the record.
The label must come first because it tells software how to read the rest, and the separator must come last. Only the second option keeps both in place.
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