The Rational Unified Process (RUP) is a software engineering process. which captures many of best practices in modem software development. The notions of (71) and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions-time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive (72) which is concluded with a well-defined (73) and can be further broken down into (74) -a complete development loop resulting in a release of an executable product, a subset of the final product under development，which grows incrementally to become the final system. The content structure refers to the disciplines, which group (75) logically by nature.

A．milestone
B．end-mark
C．measure
D．criteria

明太祖朱元璋死后，爆发了一场皇位争夺战。起于建文元年（1399年）燕王朱棣以“清君侧之恶”的名义举兵反抗朝廷，至建文四年朱棣由燕王荣登皇位而结束，历时4年。这场战争史称什么？