Read each sentence to find out whether there is any grammatical error or idiomatic error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer. If there is 'No error', the answer is '( e )'. (ignore errors of punctuation, if any).
`underset((a))ul("As the prison will get")//underset((b))ul("an official telephone facility soon, the prisoners")//underset((c))ul("wont have to make calls in discreet manner")//underset((d))ul("through smuggled mobile phones.")//underset((e))ul("No error")`

Answer

e

Explanation

No error