Chart Axis

D.

The correct answer is D. apex:axis.

The apex:axis component defines an axis for a chart. It is used to set the units, scale, labeling, and other visual options for the axis. This component can be used to define up to four axes for a single chart, one for each edge. It is important to note that this component must be enclosed within an apex:chart component and is only applicable to bar and line charts.

Here are some of the attributes that can be used with the apex:axis component:

• type: The type of axis, such as numeric or category.
• position: The position of the axis, such as top, bottom, left, or right.
• title: The title of the axis.
• gridLines: Whether or not to display grid lines.
• labels: Whether or not to display axis labels.
• labelRotation: The rotation of the axis labels.
• maximum: The maximum value of the axis.
• minimum: The minimum value of the axis.
• interval: The interval between tick marks.

For example, here is a sample apex:chart component with two apex:axis components:

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<apex:chart height="400" width="600" data="{!data}">   <apex:axis type="numeric" position="left" title="Sales Amount ($)" gridLines="true" labels="true" maximum="100" minimum="0" interval="20"/>   <apex:axis type="category" position="bottom" title="Month" gridLines="false" labels="true" labelRotation="45"/>   <apex:barSeries axis="left" xField="month" yField="sales"/> </apex:chart> 

In this example, the apex:chart component defines a bar chart with two axes. The first apex:axis component defines a numeric axis on the left side of the chart with a title of "Sales Amount ($)", grid lines, and labels. It also sets the maximum value to 100, the minimum value to 0, and the interval between tick marks to 20. The second apex:axis component defines a category axis on the bottom of the chart with a title of "Month", labels, and a label rotation of 45 degrees. Finally, the apex:barSeries component is used to define the data to be displayed in the chart.