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Apache Spark supports multiple programming languages for developing distributed applications: Java (Option A): Supported through Spark's JVM-based APIs. Scala (Option B): Spark is natively written in Scala, and Scala APIs provide full functionality. Python (Option C): Supported via PySpark, enabling Python developers to leverage Spark. Additionally, Spark also supports R and SQL-like queries, making it versatile for data scientists and engineers. Thus, the correct answer is Option D (All of the above). Reference: DASCA Data Scientist Knowledge Framework (DSKF) - Programming Tools: Spark APIs for Java, Scala, Python, and R.