UML－based tools are often used for J2EE／.NET application analysis and design,bot

UML-based tools are often used for J2EE/.NET application analysis and design，both because UML's object orientation is ideal for the J2EE/.NET implementation(66) and because of the expanding scope and complexity of today's enterprise endeavors．(67) the approaches perge at the coding/implementation phase，a common Set of analysis and design techniques applies to both J2EEand.NET．

The use of a virtual machine (VM) architecture is also common to J2EE and .NET. Application development tools(68) intermediate-level code instead of platform-specific binary code, which means the VM interprets that code in real time or performs Just-In-Time (JIT) compilation; the Microsoft VM always runs JIT-compiled code. This VM-based model results in(69)-independent applications and is conducive to the late-binding technique that's(70) to the OO approach.

A．block

B．model

C．module

D．group

B