Final answer:
The 802.11g wireless standard supports a single MIMO stream, as it predates the introduction of MIMO technology which was first included in the IEEE 802.11n standard.
Step-by-step explanation:
The maximum number of Multiple Input Multiple Output (MIMO) streams supported by the 802.11g wireless standard is one. The 802.11g standard, introduced in 2003, operates at 2.4 GHz and can support a maximum data rate of 54 Mbps. However, it does not support MIMO technology, which allows multiple streams of data to be transmitted simultaneously to increase throughput and improve signal quality. MIMO was introduced later in the IEEE 802.11n standard.