Which of the following are true about System.Security.Cryptography under version 3.5 of the framework

Determining the availability of sufficient memory for an operation can be accomplished by:

Which characteristics are found in a query expression?

The default number of threads per processor in the System.Threading.ThreadPool class under version 3.5 of the Framework is:

What impact will using implicitly typed local variables as in the following example have? var sample = 'Hello World';

class Sample { public Sample(int x) { } } In the above code, which of the following other class constructors can directly access the provided constructor?

Which encodings are NOT supported by classes in the System.Text namespace?

Which conditions are true regarding System.Diagnostics.Trace?

Which are true about namespaces and assemblies?

Which of the listed characteristics is found in the following code sample? [DllImport('msvcrt.dll')] public static extern int puts([MarshalAs(UnmanagedType.LPStr)] string m);

Which one is NOT a valid C# preprocessor directive?