To answer this question, we need to understand the file extensions associated with Actuate Reports.
Option A) Actuate Report Design (.rod file) - This option is incorrect. The .rod file extension is used for Actuate Report Design files, which contain the layout and formatting information for a report. These files do not contain the source code of the design.
Option B) Actuate Report Executable (.rox file) - This option is incorrect. The .rox file extension is used for Actuate Report Executable files, which are the compiled version of a report and do not contain the source code.
Option C) Actuate Basic Source (.bas file) - This option is correct. The .bas file extension is used for Actuate Basic Source files, which contain the source code of the design. Actuate Basic is a programming language used for creating custom functions and scripts in Actuate reports.
Option D) Actuate Report Document (.roi file) - This option is incorrect. The .roi file extension is used for Actuate Report Document files, which are the final output of a report and do not contain the source code.
Therefore, the correct answer is Option C. The Actuate Basic Source (.bas file) contains the source code of the design.