An update button on a webpage is used to check for new data from a database. When the button is clicked the text beside the button is updated to show the time and date of the last record inserted in to the database. This activity is done

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asynchronously using AJAX.

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What is the order of execution of the following items in an AJAX asynchronous process call to a server? $($you only need to provide the letters in your answer$)$

a$.$ Event listener is registered

Query issued to database server to retrieve the 'last record added' data

Execution of event handler function

Last record inserted data returns from server

User clicks on check status button

Time and Date updated on the webpage

Execution of call$-$back function

Status check request sent to the server

Status check request received by the server