MIMO was initially developed in the year . . . . . . . .

The correct answer is: B. 1990

MIMO (multiple-input multiple-output) is a technology that allows multiple antennas to transmit and receive data at the same time. This can be used to improve the performance of wireless networks by increasing the capacity and range of the network.

MIMO was initially developed in the early 1990s by researchers at Bell Labs. The technology was first used in commercial products in the late 1990s.

MIMO is now widely used in wireless networks, including Wi-Fi, LTE, and 5G. The technology has helped to improve the performance of wireless networks and make them more reliable.

Here is a brief explanation of each option:

• A. 1970: This is incorrect. MIMO was not developed in the 1970s.
• B. 1990: This is the correct answer. MIMO was initially developed in the early 1990s.
• C. 1960: This is incorrect. MIMO was not developed in the 1960s.
• D. 1985: This is incorrect. MIMO was not developed in 1985.