问题：

[单选]

You work as an application developer at Certkiller .com. Certkiller .com has asked you to create a multi-threaded application， which executes a critical database 
backup operation on an hourly basis. You define this operation with the following code： 
public void BackupDB （） { 
//Implementation code } 
You then create a Thread object for the purpose of invoking this method. 
You need to ensure that the thread is scheduled for execution before any other thread at runtime.What should you do？（）

A . A
B . B
C . C
D . D