Which salesforce org has a complete duplicate copy of the production org including data and configuration?

Which exception type cannot be caught ?

Given the following trigger implementation:
trigger leadTrigger on Lead (before update){
final ID BUSINESS_RECORDTYPEID = '012500000009Qad';
for(Lead thisLead : Trigger.new){
if(thisLead.Company != null && thisLead.RecordTypeId != BUSINESS_RECORDTYPEID){ thisLead.RecordTypeId = BUSINESS_RECORDTYPEID;
}
}
}
The developer receives deployment errors every time a deployment is attempted from Sandbox to Production.
What should the developer do to ensure a successful deployment?

In the following example, which sharing context will myMethod execute when it is invoked?

A developer needs to have records with specific field values in order to test a new Apex class.
What should the developer do to ensure the data is available to the test?