Over what interval is the function in this graph constant?10-1010-10A. 6 S XS 10B. -10 5 XS-4C. 1 S XS6D. -4$X$1

In a graph, constant functions are represented as horizontal lines. According to this, the function is constant from 1 to 6.
It means that the correct choice is C. 1≤x≤6