Prior to the availability of enterprise EDM, locating a document over a LAN could be difficult, and over a WAN (1) nearly impossible. With the model for collaborative work spreading, and with more users sharing (2) documents through e-mail and the Internet, enterprise EDM had become a necessity.

Many businesses are finding their greatest competitive advantage is the ability to harness the document (3) lifecycle. EDM systems manage this lifecycle from creation, revision, storage and (4) retrieval to routing and workflow. They also allow users to work on documents collaboratively.

Reusability of information is EDM’s main benefit, as well as the key to creating the paradigms that drive business process (5) reengineering.

3（）

A．database

B．controller

C．lifecycle

D．center

2011年，刘某与妻子离婚，夫妻俩谁也不愿放弃儿子刘凯的抚养权，最后法院将读小学的儿子判给了刘某。刘某与前妻非常宠爱儿子，离婚后，他们经常在校门口争着接儿子放学回家，以致刘凯和小伙伴玩耍的机会都没有，而刘某和前妻谁接不到儿子都很失落。刘凯的一个生日要隆重地过两次。起初，刘凯还经常打电话安慰失落的父亲、母亲，后来他渐渐承受不住如此沉重的父爱、母爱，开始厌恶他们，并进行报复。他常常想方设法逃离父母的关心，有时在半夜偷偷离家出走，被追回后整日把自己锁在屋里，不吃不喝，一个人发呆。

[问题]

在上述案例中，案主刘凯面临的困境主要有哪些