The correct answer is: A. Option Strict On
Option Strict is a compiler option that controls how implicit type conversions are handled in Visual Basic. When Option Strict is On, the compiler will only allow implicit type conversions that are explicitly declared. This helps to prevent errors caused by implicit type conversions, such as when a variable of one type is assigned to a variable of another type without an explicit conversion.
Option Strict Off is the default setting for Option Strict. When Option Strict is Off, the compiler will allow implicit type conversions unless they are explicitly prohibited. This can be useful when you need to be able to work with data of different types without having to worry about explicit type conversions. However, it can also lead to errors if you are not careful.
Implicit Off is not a valid option for Option Strict.
Explicit On is not a valid option for Option Strict.
Here is an example of how Option Strict can be used to prevent errors:
“`
Option Strict On
Dim x As Integer
Dim y As String
x = y
‘This will generate an error, because y is a string and x is an integer.
x = CInt(y)
‘This will assign the value of y to x, because CInt() is an explicit conversion.
“`