What feature enables the Windows physical memory maximum of 4GB to be extended to 64GB?

Which of the following are benefits of using VPNs? (Choose all that apply)

a. Eliminates the need for expensive dedicated WAN links b. Uses advanced encryption and authentication protocols c. Supports DSL and cable d. Cost savings using ISDN and PSTN connections e. Easy to add new users f. Cost savings using PVCs

Which of the following statements are true?

a. ObjectInputStream/ObjectOutputStream enables you to perform I/O for objects in addition for primitive type values and strings. b. Since ObjectInputStream/ObjectOutputStream contains all the functions of DataInputStream/DataOutputStream, you can replace DataInputStream/DataOutputStream completely by ObjectInputStream/ObjectOutputStream. c. To write an object, the object must be serializable. d. The Serializable interface does not contain any methods. So it is a mark interface. e. If all the elements in an array is serializable, the array is serializable too.