Which of the following is a valid insert statement in mongodb? Select all valid.

Question

Options

• Adb.test.push({x:2,y:"apple"})
• Bdb.test.insert«"x":2, "y":"apple"})
• Cdb.test.insert({x:2,y:"apple"})
• Ddb.test.insert({x:2},{y:"apple"})

Explanation

Option C is the only valid MongoDB insert statement. db.collection.insert() accepts a single document object (or an array of documents) as its argument, making db.test.insert({x:2,y:"apple"}) the correct form.

Why the others are wrong:

• A - .push() is not a collection method in MongoDB; $push is an array update operator used inside update operations, not for inserting new documents.
• B - Uses « (a guillemet character) instead of ( to open the function call, making it a syntax error that would fail immediately in the shell.
• D - insert() does not accept two separate document arguments to insert two records; to insert multiple documents you must pass them as an array: db.test.insert([{x:2},{y:"apple"}]). The second argument position is reserved for an options object (e.g., {ordered: false}), not another document.

Memory tip: Think of insert() as a single slot - it takes one thing: either one document {} or one array []. If you want multiple documents, wrap them in square brackets.

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