To which primitive data type in Apex is a currency field atomically assigned?

A developer needs to create a custom button for the Account object that, when clicked, will perform a series of calculation and redirect the user to a custom visualforce page.
Which three attributes need to be defined with values in the <apex:page> tag to accomplish this?
Choose 3 answers

What is a capability of the <ltng:require> tag that is used for loading external Javascript libraries in Lightning Component? (Choose three.)

What are two characteristics of partial copy sandboxes versus full sandboxes? Choose 2 answers

The orderHelper class is a utility class that contains business logic for processing orders. Consider the following code snippet:
A developer needs to create a constant named DELIVERY_MULTIFILTER with a value of 4.15. The value of the constant should not change at any time in the code.
How should the developer declare the DELIVERY_MULTIFILTER constant to meet the business objectives?