The addition of information to a pdu as its passed from one layer to the next is called Encapsulation.
Answer:
One.
Explanation:
In this case, when a developer writes a SOQL query in order to find to find child records for a specific parent, one search will return only one child. One level down i.e., from parent to child, or five levels up i.e., from child to parent. Note that SOQL statements will not return relationships that are greater than one level apart from the root entity object.
It could be c or d because when you are chatting to someone through say Skype you use fonts and colors to identify who you are talking to. But in most cases it would be d