C. Model.ldf
The .ldf file is the transaction log file for an MSSQL database and contains a record of all the transactions and the database modifications made by each transaction.
The SQL Server stores data and logs in Primary Data Files (MDF), Secondary Data Files (NDF) and Transaction Log Data Files (LDF), respectively.
MDF is the starting point of a database; it stores user data and database objects
NDF is optional and spreads data across multiple databases
LDF stores log related information that can be used to recover databases. These are divided into smaller parts called virtual log files.
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