Explanation/Reference:
A: A Threshold represents a significant value range like quota, target or limit value etc. When the indicator
falls into one of the threshold ranges, it means certain criteria have been met or not. Different threshold
ranges in gauges may have different colors, which you may customize.
C: The Vertical Status Meter and Status Meter are meters with a rectangular indicator placed in a bounding
box. It looks like a mercury barometer.
Incorrect Answers:
B: The Indicator shows the metric value of the Gauge. There are three types of indicators for Dial Gauges:
Line, Needle and Fill. Line and Needle are rotating pointers to show the metric value by pointing to certain
angle on the dial. The Needle indicator is thicker than the Line indicator. Fill is a slice or section of the dial
that fills from the minimum value up to the metric value. Users may specify the indicator fill color and
border color.
D: The simplest data model for a Gauge is a single metric value, which can be specified by the value
attribute. In addition, the threshold, minimum and maximum values can also be specified by Threshold tag,
and the minValue and maxValue attributes respectively.
References: https://docs.oracle.com/cd/E21764_01/apirefs.1111/e12418/tagdoc/dvt_gauge.html