What does the following Javascript function do? function mysteryFunction(arg) { for (let key in arg) { if (typeof(arg[key]) "number") { === arg[key] * 2 arg[key]; } } return arg; } а. Takes an object as an argument and adds a new key that is twice the value of the maximum of the old keys. O b. Takes an object as an argument, loops through the entries of the object, and if the value of the entry is numeric, doubles it and returns the modified object. Creates an array of type "number" and sets each array element to be twice the value of the previous element.

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