private void init() {

		help = new HelpLocation(HELP_TOPIC, "DiffApplySettingsToolOptions");
		Options options = plugin.getTool().getOptions(DIFF_OPTIONS);
		options.setOptionsHelpLocation(help);

		// Set the help strings
		options.registerOption(OPTION_PROGRAM_CONTEXT, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("program context register value",
				"program context register values"));
		options.registerOption(OPTION_BYTES, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("byte", "bytes"));

		options.registerOption(OPTION_CODE_UNITS, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("code unit", "code units"));

		options.registerOption(OPTION_REFERENCES, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("reference", "references"));
		options.registerOption(OPTION_PLATE_COMMENTS, MERGE_CHOICE.MERGE, help,
			getMergeDescription("plate comment", "plate comments"));
		options.registerOption(OPTION_PRE_COMMENTS, MERGE_CHOICE.MERGE, help,
			getMergeDescription("pre-comment", "pre-comments"));
		options.registerOption(OPTION_EOL_COMMENTS, MERGE_CHOICE.MERGE, help,
			getMergeDescription("end of line comment", "end of line comments"));
		options.registerOption(OPTION_REPEATABLE_COMMENTS, MERGE_CHOICE.MERGE, help,
			getMergeDescription("repeatable comment", "repeatable comments"));
		options.registerOption(OPTION_POST_COMMENTS, MERGE_CHOICE.MERGE, help,
			getMergeDescription("post comment", "post comments"));
		options.registerOption(OPTION_SYMBOLS, SYMBOL_MERGE_CHOICE.MERGE_AND_SET_PRIMARY, help,
			getSymbolDescription());
		options.registerOption(OPTION_BOOKMARKS, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("bookmark", "bookmarks"));
		options.registerOption(OPTION_PROPERTIES, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("property", "properties"));
		options.registerOption(OPTION_FUNCTIONS, REPLACE_CHOICE.REPLACE, help,
			getReplaceDescription("function", "functions"));
		options.registerOption(OPTION_FUNCTION_TAGS, MERGE_CHOICE.MERGE, help,
			getReplaceDescription("function tag", "function tags"));
		options.registerOption(OPTION_SOURCE_MAP, REPLACE_CHOICE.IGNORE, help,
			getReplaceDescription("source map", "source map"));

		getDefaultApplyFilter();
	}
Initializes class variables for this option manager and gets the default options.
Ghidra/Features/ProgramDiff/src/main/java/ghidra/app/plugin/core/diff/DiffApplySettingsOptionManager.java