<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def preprocess_record(self, pid, record, links_factory=None, **kwargs):
 """Prepare a record and persistent identifier for serialization."""

        links_factory = links_factory or (lambda x, record=None, **k: dict())
        metadata = copy.deepcopy(record.replace_refs()) if self.replace_refs \
            else record.dumps()
        return dict(
            pid=pid,
            metadata=metadata,
            links=links_factory(pid, record=record, **kwargs),
            revision=record.revision_id,
            created=(pytz.utc.localize(record.created).isoformat()
                     if record.created else None),
            updated=(pytz.utc.localize(record.updated).isoformat()
                     if record.updated else None),
        )