Go back to MB2-228 - Microsoft CRM 1.2 Extending Microsoft CRM with .NET

Question :-

The Microsoft CRM 1.2 SDK describes categories of customizations as "Fully Upgradable" or "Mostly Upgradable". Which of the following CRM customizations are "Mostly Upgradeable" according to the Microsoft CRM 1.2 SDK?
Post-callouts.
Code developed for OnChange events.
Customizations using the MS CRM SDK.
Customizations using Microsoft CRM Tools.

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