SDM: Class diagrams

Quick questions

Q1 In UML a class is represented by:
A cloud
An ellipse
A rectangle
A Klein bottle

Q2 Which of these might be a good name for a class?
Customer
Customers
customer
customers

Q3 An attribute with name "name" and type String is shown as:
name, type=String
String name
name : String
name (String)

Q4 Suppose we have an association between a class Wheel and a class Bicycle with the obvious interpretation. The multiplicity at the Wheel end of the association should be:
0
1
2
0..*