Odesk Magento test

1. An observer in Magento is defined as a:

1. Method
2. Class
3. Event
4. None Of These

CORRECT ANSWER IS : 

2.Assuming a left column is going to be added, which of the following are possible values of the block type in the code below?
<block type="" name="left" as="left" template="page/html/left.phtml" />

1. catalog/navigation
2. core/text_list
3. page/template_container
4. page/html

CORRECT ANSWER IS :