async def get(self,request_configuration: Optional[RequestConfiguration[DispositionReviewStagesRequestBuilderGetQueryParameters]] = None) -> Optional[DispositionReviewStageCollectionResponse]:
        """
        When action at the end of retention is chosen as 'dispositionReview', dispositionReviewStages specifies a sequential set of stages with at least one reviewer in each stage.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[DispositionReviewStageCollectionResponse]
        """
        request_info = self.to_get_request_information(
            request_configuration
        )
        from ......models.o_data_errors.o_data_error import ODataError

        error_mapping: dict[str, type[ParsableFactory]] = {
            "XXX": ODataError,
        }
        if not self.request_adapter:
            raise Exception("Http core is null") 
        from ......models.security.disposition_review_stage_collection_response import DispositionReviewStageCollectionResponse

        return await self.request_adapter.send_async(request_info, DispositionReviewStageCollectionResponse, error_mapping)

        When action at the end of retention is chosen as 'dispositionReview', dispositionReviewStages specifies a sequential set of stages with at least one reviewer in each stage.
        param request_configuration: Configuration for the request such as headers, query parameters, and middleware options.
        Returns: Optional[DispositionReviewStageCollectionResponse]
        
msgraph/generated/security/labels/retention_labels/item/disposition_review_stages/disposition_review_stages_request_builder.py