Answer: variable; fixed
Step-by-step explanation:
In the short run, these workers are variable inputs, and the ovens are fixed Inputs.
In the short run, variable inputs in production can be changed to adapt to the changing economic conditions while fixed inputs cannot. In the long run however, all inputs are variable and so can be changed.
As this is the short run and the workers can be changed, they are the variable inputs.
The ovens however, cannot be changed so the ovens are the fixed inputs.