A data series to be rendered as connected points in a Visualforce chart. At a minimum you must
specify the fields in the data collection to use as X and Y values for each point, as well as the X
and Y axes to scale against.

Note: This component must be enclosed within an <apex:chart> component. You can have
multiple <apex:barSeries> and <apex:lineSeries> components in a single chart.

A.
apex:pageblockSection

B.
apex:inputHidden

C.
apex:lineSeries

D.
apex:inputSecret