What Magento function can we employ to give special product pricing to specific customer groups based on qty purchased?

When changes are made to more than one of a collection’s items using 'setData('some', 'value')', which methods will save the changes in the collection?

What is a Composite Product?

Which code snippet is used to show ALL products in your catalog on your front page?

You need to change an username permission access. How do you change it?

A custom frontend controller will extend which one of the following classes?

Which product pricing fields is used to offer a quantity discount on the catalog list and the product detail pages, and the discount can be applied to a specif‌ic store view or a customer group?

Which xpath is correct for replacing Mage_Customer_Model_Address via Mage::helper ('customer/address')?

Which characters are NOT valid for the 'Attribute Code' property when you add a new attribute for a product?

Which field is used to identify countries from which you accept the orders?

Which validation checks for the data entered in a field are available?