Which type of controller is best suited when you want all of the basic DML functions from an object's normal new/edit page?

A company has a custom object, Order__c, that has a custom picklist field, Status__c, with values of 'New',
'In Progress', or 'Fulfilled' and a lookup field, Contact__c, to Contact.
Which SOQL query will return a unique list of all the Contact records that have no 'Fulfilled' Orders?
SELECT Id FROM Contact WHERE Id NOT IN (SELECT Id FROM Order__c WHERE

Example 1:
AggregateResult[] groupedResults = [SELECT CampaignId, AVG(Amount) FROM Opportunity GROUP BY CampaignId]; for (AggregateResult ar : groupedResults)
{
System.debug('Campaign ID' + ar.get('CampaignId'));
System.debug('Average amount' + ar.get('expr0'));
}
Example 2:
AggregateResult[] groupedResults = [SELECT CampaignId, AVG(Amount) theAverage FROM Opportunity GROUP BY CampaignId]; for (AggregateResult ar : groupedResults)
{
System.debug('Campaign ID' + ar.get('CampaignId'));
System.debug('Average amount' + ar.get('theAverage'));
}
Example 3:
AggregateResult[] groupedResults = [SELECT CampaignId, AVG(Amount) FROM Opportunity GROUP BY CampaignId]; for (AggregateResult ar : groupedResults)
{
System.debug('Campaign ID' + ar.get('CampaignId'));
System.debug('Average amount' + ar.get.AVG());
}
Example 4:
AggregateResult[] groupedResults = [SELECT CampaignId, AVG(Amount) theAverage FROM Opportunity GROUP BY CampaignId]; for (AggregateResult ar : groupedResults)
{
System.debug('Campaign ID' + ar.get('CampaignId'));
System.debug ('Average amount' + ar.theAverage);
}
Which two of the examples above have correct System.debug statements? (Choose two.)

A company exposes a REST web service and wants to establish two-way SSL between Salesforce and the REST web service. A certificate signed by an appropriate certificate authority has been provided to the developer.
What modification is necessary on the Salesforce side? (Choose two.)

Which use case is an appropriate fit for the future asynchronous Apex method? (Choose two.)