Which two code segments should you use?

You are developing an application that includes the following code segment:

You need to implement the Open() method of each interface in a derived class named UseResources and call
the Open() method of each interface.
Which two code segments should you use? (Each correct answer presents part of the solution.
Choose two.)

A.
Option A

B.
Option B

C.
Option C

D.
Option D

Explanation:
* An interface contains only the signatures of methods, properties, events or indexers. A class or struct that
implements the interface must implement the members of the interface that are specified in the interface
definition.
* Example:
interface ISampleInterface
{
void SampleMethod();
}
class ImplementationClass : ISampleInterface
{
// Explicit interface member implementation:
void ISampleInterface.SampleMethod()
{
// Method implementation.
}
static void Main()
{
// Declare an interface instance.
ISampleInterface obj = new ImplementationClass();
// Call the member.
obj.SampleMethod();
}
}