Answer:
The function represents this scenario is:

It is true that function is a step function.
Explanation:
Consider the provided information.
Let x is the number of years of service.
For less than use the inequality < and for at least use the inequity ≤.
It is given that employees that have been with the company for less than three years can expect to receive an increase of $0.50 per hour.
Which can be written as:
0.05 if 0 ≤ x < 3
Employees that have been with the company for at least three years, but less than six years can expect an increase of $1.00.
This can be written as:
1.00 if 3 ≤ x < 6
Employees that have been with the company for at least six years, but less than nine years, receive an increase of $1.50 per hour.
This can be written as:
1.50 if 6 ≤ x < 9
And, employees of at least nine years, but less than twelve years receive an increase of $2.00.
This can be written as:
2.00 if 9 ≤ x < 12
Hence, the function represents this scenario is:

Step function is the is a piece wise function includes all constant piece.
For example:

The obtained function is also a piece wise function includes all constant piece.
Hence, it is true that function is a step function.