Discuss how you would convert a program with ten menu options to one that uses submenus. Use the following example. The program has the following options to beging with:$$

$1.$Process a sale

$2.$Process a return

$3.$Add a record to the inventory file

$4.$Search for a record in the inventory file

$5.$Modify a record in the inventory file

$6.$Delete a record in the inventory file

$7.$Print an inventory list report

$8.$Print a list of inventory items by cost

$9.$Print a list of inventory items by age

$10.$Print a list of inventory items by retail value

We want to turn this into a program that presents $4$ submenus as follows:$$

$1-$ Main Menu

a$.$Process a Sale or a Return

b$.$Update the Inventory File

c$.$Print an Inventory Report

d$.$Exit the Program

$2-$ Sales and Returns Menu

a$.$Process a Sale

b$.$Process a Return

c$.$Go Back to the Main Menu

$3-$ Update Inventory File Menu

a$.$Add a Record

b$.$Search for a Record

c$.$Modify a Record

d$.$Delete a Record

e$.$Go Back to the Main Menu

$4-$ Inventory Report Menu

a$.$Print an inventory list report

b$.$Print a list of inventory items by cost

c$.$Print a list of inventory items by age

d$.$Print a list of inventory items by retail value

e$.$Go Back to the Main Menu

Needless to say, you do not need to implement each method. For the innermost methods, just add a comment stating "Code for xxxxxxx$".$ You need to have a main module, and modules for menu and submenu items. Inside the submenu items you can just put in a comment.$$Please write simple pseudocode without specifying any language.