When a program lets the user know that an invalid input choice has been made, this is known as

The correct answer for the given question is " input validation"

Explanation:

Input validation is also known as data validation which is used for validate or test the user input .

The example of input validation in c++ programming

#include <iostream> // header file

using namespace std;  

int main()  // main function

{

 int a1; // variable declarartiomn

 cout << "Enter the age: ";

 cin >> a1;

 if(a1> 18) // validate user input

 {

  cout << "You are eligible for vote :";

 }

return 0;

}

In this program we input a age from user and validate this user input that .If user enter age > 18 then it will eligible for vote.

output

21

You are eligible for vote

the correct answer is "part of speech" if the portion used is "verb, noun" there is another question similar to this with the same question but different portion. the other portion is "hand write" and the correct component for that question is "antonym".

hope this . : )