When you try to load data like `AirPassengers` in R, using the function `data()`, the dataset is loaded as a `Promise`, rather than a `dataframe`. What is `Promise`? #RStats #DataScience [TimeStamp:05072021123038]
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Options: 1. An unevaluated expression 2. An environment for expression's evaluation 3. A placeholder to hold the expression's value 4. All of the above