Final answer:
The command line tools that use import files to add user objects in Active Directory are Ldifde.exe, which uses the LDIF format, and Csvde.exe, which uses CSV files. Dsadd.exe and Net.exe are other Active Directory-related tools that do not use import files for this purpose.
Step-by-step explanation:
The command line tools that use an import file to add user objects in Active Directory are Ldifde.exe and Csvde.exe. The Ldifde.exe tool uses the LDAP Data Interchange Format (LDIF), which is a standard plain text data format for representing LDAP directory entries and LDAP-directory update requests. On the other hand, Csvde.exe imports and exports data from Active Directory using a comma-separated values (CSV) file, which is another type of plain text file that contains data separated by commas.
Both of these tools are useful for bulk operations in Active Directory, such as when you need to add a large number of users at once. Dsadd.exe is a command used to add objects to Active Directory but it does not use an import file. Net.exe is a command-line tool used to manage accounts and groups, start or stop services, and other network-related tasks, but it also does not work with import files for adding user objects specifically to Active Directory.