If $pen$ is $table$,$table$ is $fan$,$fan$ is $chair$ and $chair$ is $roof$,on which of the following will a person sit?

In a certain code language:
$(A)$ 'pit dar na' means 'you are good';
$(B)$ 'dar tok pa' means 'good and bad';
$(C)$ 'Him na tok' means 'they are bad'.
To find the answer to the above question,which of the following statements can be dispensed with?

In a certain code,$15789$ is written as $EGKPT$ and $2346$ is written as $ALUR$. How is $23549$ written in that code?

In a certain code,$786$ means 'study very hard',$958$ means 'hard work pays' and $645$ means 'study and work'. Which of the following is the code for 'very'?

If wall is called window,window is called door,door is called floor,floor is called roof and roof is called ventilator,what will a person stand on?