Which of these is NOT a valid type of computer

An Arm And A Leg

Select the most appropriate meaning of the bold idiom in the given sentence.

Cast Iron Stomach

Select the most appropriate meaning of the given idiom. 

To call the shots

To bite the dust

Select the most appropriate meaning of the underlined idiom in the given sentence.

"All politicians blame each other and tell themselves good; it's like pot calling the kettle black ."

At Your Wits’ End

I thought the illness was going to take him, but now he is ______________.