Biometric systems include all but which of the following?

The index number of a ComboBox object can be assigned to a(n) ____ data type variable.

A. Decimal B. Integer C. Whole D. Null

In C#, Java, and Objective-C, String objects are immutable, meaning that after strings are created, they can't be changed. Therefore, the following code is illegal:String str1 = "abc";str1 = str1 + "123";

Answer the following statement true (T) or false (F)