Which of the following is the frequency range to tune IEEE 802.11a network?

The 1.15-3.825 GHz range does not correspond to any IEEE 802.11 standard frequency allocation and is not used for Wi-Fi.

The IEEE 802.11a standard was designed for the UNII (Unlicensed National Information Infrastructure) bands in the 5 GHz range, covering 5.15-5.825 GHz. This higher frequency band provides up to 54 Mbps throughput and reduces interference with 2.4 GHz devices such as those using 802.11b/g.

The 5.25-9.825 GHz range exceeds the actual upper bound of 802.11a and includes frequencies not allocated to this standard.

The 6.25-9.825 GHz range is entirely outside the 802.11a specification and overlaps with bands used by other technologies such as 802.11ax (Wi-Fi 6E) only partially and under different rules.