Given the concerns about the reliability of the OMS, implementing scheduled batch exports ensures that order data is not lost due to potential OMS downtime and allows for reattempting failed exports. Option B uses SFTP for a high-frequency batch export, which can be scheduled to run multiple times a day, ensuring minimal delay in order synchronization while marking orders as exported upon successful transmission. Option C provides a similar safeguard but via web service, which can be scheduled to run hourly. Both methods enable tracking of export status and can handle temporary downtimes by reattempting the export until successful, aligning with the need for reliability in integration processes.