how to randomly select image to display on random button

i want to display 4 random images, in that one image is correct image. so i picked 1 random image from "correct_caps" folder and rest 3 from another folder. now i want to choose random image variables to display that images so that my correct image always change its place.

 using UnityEngine;
 using UnityEngine.SceneManagement;
 using UnityEngine.UI;
 using UnityEngine.EventSystems;
 
 
 
 public class NewBehaviourScript : MonoBehaviour
 {
     public Image art1;
     public Image art2;
     public Image art3;
     public Image art4;
    
     
     public int x;
     public int x1;
     public int x2;
     public int x3;
 
     public string s;
     public string path;
     public string path1;
     public string path2;
     public string path3;
     public string path4;
  
     public int cl;
     public int i;
   
    
     void Start()
     {
 
        
         //selection of correct letter
         cl = Random.Range(1, 26);
        
         path1 = "Capital Letters/correct_caps/" + cl;
         path = "Capital Letters/" + cl;
         Debug.Log("Load path is " + path1);
        
 
         x1 = Random.Range(1, 5);
         path2 = path + "/" + x1;
         
 
 
         x2 = Random.Range(1, 5);
         path3 = path + "/" + x2;
         i = 0;
         while (i == 0)
         {
             if (x1 == x2)
             {
 
                 x2 = Random.Range(1, 5);
                 path3 = path + "/" + x2;
                 Debug.Log("Load path3 is " + path3);
 
             }
             else
             {
 
                 Debug.Log("Load path3 is " + path3);
                 i++;
             }
         }
        
  
 
 
         x3 = Random.Range(1, 5);
         path4 = path + "/" + x3;
        
         i = 0;
         while (i == 0)
         {
             if (x1 == x3 || x2 == x3)
             {
                 x3 = Random.Range(1, 5);
                 path4 = path + "/" + x3;
                 Debug.Log("Load path4 is " + path4);
             }
             else
             {
 
                 Debug.Log("Load path4 is " + path4);
                 i++;
             }
         }
        
 //here i displayed images . but i want to select art,art1,art2,art3 randomly.
 
 art.sprite = Resources.Load<Sprite>(path1) as Sprite; 
 art1.sprite = Resources.Load<Sprite>(path2) as Sprite;
         art2.sprite = Resources.Load<Sprite>(path3) as Sprite;
        art3.sprite = Resources.Load<Sprite>(path4) as Sprite;  
     }    
 
     }