Which ping option lets you specify the packet buffer size for each packet?

The correct option for specifying the packet buffer size in a ping command is the '-l' option. This option allows you to set the size of the packet buffer used for each echo request sent during the ping operation. By customizing the buffer size, you can test the network's ability to handle different sizes of packets, which can be crucial for diagnosing issues related to packet fragmentation or determining the maximum transmission unit (MTU) settings.

The '-s' option is commonly associated with specifying the size of the packet in some contexts, but in the standard ping command, it usually serves a different purpose or may not even be present, depending on the operating system.

The '-b' option is typically used to send a ping to a broadcast address, rather than setting the packet size. This can be useful for network diagnostics but does not involve buffer size management.

The '-f' option is used to enable "flood ping," which sends packets as quickly as possible, but again, it does not relate to specifying buffer size.

Thus, the '-l' option directly correlates with adjusting the packet size, making it the correct choice for this question.