Which of the following is a correct remark?

The correct option is the one that adheres to the standardized format of aviation weather reporting. In this context, the remark "RAB1458 TSB1456E31" conveys critical weather information in a concise manner.

The abbreviation "RAB" indicates the start of rain, followed by "1458," which specifies the time of onset in Coordinated Universal Time (UTC) with the format HHMM. This detail is essential for pilots and meteorologists, as it identifies when the rain began, which is crucial for understanding current weather conditions.

Additionally, "TSB" signifies thunderstorms, and "1456" marks the time of occurrence, while "E31" provides the duration of the thunderstorm activity in minutes. This information helps in assessing the severity and potential impact of the storms on flight operations.

Thus, this remark is correct because it follows the proper format and effectively communicates vital weather information necessary for informed decision-making in aviation.