How many of the following use NULL to indicate failure?mysql

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How many of the following use NULL to indicate failure?
```
mysql_init(), mysql_real_connect()
```

1. 3
2. 2
3. 1
4. 0
5. None of these

Correct Option: B

Both of the client library routines named ‘mysql_init()’ and ‘mysql_real_connect()’ return a pointer to the connection handler in order to indicate success and NULL to indicate failure.