Answer:
The function that is graphed is:

Step-by-step explanation:
We could clearly observe from the graph that:
when x=1 we have the value of the function as: f(1)=3
This means that from the given options we will check which option satisfies this property.
1)

when x=1 we have:

As we know that the logarithmic function is not defined for the negative value.
Hence, this option is incorrect.
2)

when x=1 we have:

Hence, this option is incorrect.
4)

when x=1 we have:

Hence, this option is incorrect.
3)

When we plot this function we get the same graph as shown.
Also f(1)=3
Hence, this option is correct.