Option A is incorrect because using batch prediction mode instead of online mode does not solve the “Out of Memory” error, but rather changes the latency and throughput of the prediction service.  Batch prediction mode is suitable for large-scale, asynchronous, and non-urgent predictions, while online prediction mode is suitable for low-latency, synchronous, and real-time predictions 1 .

Option B is correct because sending the request again with a smaller batch of instances can reduce the memory consumption of the prediction service and avoid the “Out of Memory” error. The batch size is the number of instances that are processed together in one request.  A smaller batch size means less data to load into memory at once 2 .

Option C is incorrect because using base64 to encode your data before using it for prediction does not reduce the memory consumption of the prediction service, but rather increases it.  Base64 encod ing is a way of representing binary data as ASCII characters, which increases the size of the data by about 33% 3 .  Base64 encoding is only required for certain data types, such as images and audio, that cannot be represented as JSON or CSV 4 .

Option D is incorrect because applying for a quota increase for the number of prediction requests does not solve the “Out of Memory” error, but rather increases the number of requests that can be sent to the prediction service per day.  Quotas are limits on the usage of Google Cloud resources, such as CPU, memory, disk, and network 5 . Quotas do not affect the performance of the prediction service, but rather the availability and cost of the service.