Does the reaction rate of a zero order reaction becomes half of its initial value,if the concentration of the reactant becomes half of its initial value?

Answer 1

I copied the following from Google.

Image result for zero order reaction rate
In some reactions, the rate is apparently independent of the reactant concentration. The rates of these zero-order reactions do not vary with increasing nor decreasing reactants concentrations. This means that the rate of the reaction is equal to the rate constant, k, of that reaction.

Answer 2

So this is not common to all reactions?

Today morning we had a Chemistry exam and we were given this question.
I can't remember the all but,
1)k
2)k/2
3)R
4)R/2
were there in the answers,where k and R are the reaction constant and the reaction rate of the reaction.

So in this what would be the answer?

I took the answer as "1(k) " considering the reasoning you've got from Google.

So what would you choose if you got this question?

The question didn't mention about any special reaction too.They've just given that this is a zero order reaction.