IsStatic Seems to Check for Non-Static Classes

[lundmikkel]

The extension method IsStatic() checks if the type is a class that is not sealed and abstract at the same time:

public static bool IsStatic(this Type type)
{
    return type.IsClass && !(type.IsSealed && type.IsAbstract);
}

Shouldn't the method check if it is sealed and abstract?

public static bool IsStatic(this Type type)
{
    return type.IsClass && type.IsSealed && type.IsAbstract;
}