Ghosh Babu has a manufacturing unit. The following graph gives the cost for a various number of units. Profit Revenue - Variable Cost - Fixed Cost. The fixed cost remains constant up to $34$ units after which additional investment is to be done in fixed assets. In any case, production can not exceed $50$ units.

If the production cannot exceed 45 units then what is the number of units than can maximise profit?

- $40$
- $34$
- $45$
- $35$