Run only selected command / line - powershell

Question

let's say that I have following Powershell script that contains severall powerhsell commands
Get-Service -Name BITS
Get-Service -Name WinDefend
Get-Service -name Winmgmt
Get-Service -Name WdNisSvc
How can I make my script like that that it would ask which of 4 commands it would run like
Select which command you would like to run:
1. Get-Service -Name BITS
2. Get-Service -Name WinDefend
3. Get-Service -name Winmgmt
4. Get-Service -Name WdNisSvc
and they based of my selection it will run only wanted command
EDIT: I was now able to solve problem this far but now issue is that: how do I prompt these to user so user can select them and save the answer so I can use it after "Write-Host "Now we can perform [$input]""
$input = Read-Host -Prompt 'Select what operation you want to perform'
1. Get-Service -Name BITS
2. Get-Service -Name WinDefend
3. Get-Service -name Winmgmt
4. Get-Service -Name WdNisSvc
if ($input) {
Write-Host "Now we can perform [$input]"
**here should then answer be executed**
} else {
Write-Warning -Message "No input selected"
}

Answer 1

You can create a menu like below.
If you're interested in learning what's being applied on the menu:
about Do
Matching Operators
about_Switch
$services = #(
'BITS'
'WinDefend'
'Winmgmt'
'WdNisSvc'
)
$servCount = $services.Count
do
{
# Phrase this correctly so it's clear user should select a Number
'Select a Service you would like to query:'
$services | ForEach-Object -Begin { $i = 1 } -Process {
"$i. $_"; $i++
}
switch -Regex($selection = Read-Host)
{
"^[1-$servCount]{1}$" {
Get-Service $services[$selection-1]
'Press ENTER to continue...'
Read-Host
Clear-Host
break
}
"Q" { break }
Default { Write-Warning 'Invalid Selection!' }
}
}
until($selection -eq 'Q')