You are creating a new notebook in Azure Databricks that will support R as the primary language but will also support Scala and SQL. Which switch…

In Azure Databricks notebooks, a default language is set upon creation. To execute code in a different language within a specific cell, you must use a "magic command" at the beginning of the cell. These commands are prefixed with a percent sign (%) followed by the name of the language. For the scenario described, even though the notebook's default language is R, you would use %scala to run Scala code or %sql to run SQL queries in individual cells, effectively switching the language context for that specific cell.

A. \\[]: This syntax is not a valid command or switch for changing languages within an Azure Databricks notebook.

C. \\[]: This is a duplicate of option A and is also incorrect for the same reason.

D. @: The @ symbol is not used as a language switch in Azure Databricks. It has different meanings in other contexts, such as decorators in Python.

1. Microsoft Learn

Azure Databricks Documentation. "Databricks notebooks." Under the section "Mix languages

" it states

"To override the default language in a cell

you can click the language button or type the language magic command % at the beginning of a cell." This explicitly confirms the use of the % symbol.

2. Microsoft Learn

Azure Databricks Documentation. "Magic commands." This document provides a comprehensive list of magic commands available in Databricks notebooks

all of which are prefixed with %. It lists %python

%r

%scala

and %sql as the primary language magic commands.