which graph represents a step function?

which graph represents a step function?
Answer
Explanation:
Step1: Recall step - function characteristics
A step - function has constant values over intervals of its domain, and has jumps (discontinuities) between these constant - value intervals.
Step2: Analyze each graph
The first graph has horizontal line - segments (constant values) and jumps between them. The second graph also has horizontal line - segments and jumps, which are characteristic of a step - function. The third graph has slanted line - segments, which are not characteristic of a step - function.
Answer:
The first and the second graphs represent step - functions.