You are developing an application that includes a class named Kiosk. The Kiosk class
includes a static property named Catalog. The Kiosk class is defined by the following code
segment. (Line numbers are included for reference only.)
You have the following requirements:
✑ Initialize the _catalog field to a Catalog instance.
✑ Initialize the _catalog field only once.
✑ Ensure that the application code acquires a lock only when the _catalog object
must be instantiated.
You need to meet the requirements.
Which three code segments should you insert in sequence at line 09? (To answer, move
the appropriate code segments from the list of code segments to the answer area and
arrange them in the correct order.)
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