You are working on a jewelry store that sells rings. Each ring allows an adjustment in size. The customer
specifies finger size in inches and the merchant physically adjusts the stocked ring to the required size.
How is this represented in Magento?

How can you render a text on a page using only layout xml?

There are two different configurable products which both share one variation. The shared variation is represented by the same simple product.
A customer added both configurables to the cart with the same selected variation?
How will they be displayed?

You have created a custom module which must perform an action immediately after an order is placed, but only on the store front of the merchant site. You have selected the checkout_submit_all_after as the target event which the module will observe.
In which file will the event observer be declared?

How many shipping addresses may be selected for an order during the checkout process?