Myers in the book "Composite structured design" :

An informational-strength module has the following definition:

1. It contains multiple entry points.
   
2. Each entry point performs a single specific function.
   
3. All of the functions are related by a concept, data structure, or resource that is hidden within the module.

1. what is entry points of the module?
   
2. and what is ** multiple entry points** of the module?
   
3. a SQL class containing 4 methods: add(), delete(), update(), retentive() has info. cohesion or functional cohesion?
   4)please give me a good example for class having info. cohesion

please answer the above 4 questions?