h$.$ Which are true about Ethernet protocols? i$.$ Ethernet is commonly used for the link$-$layer protocol for long$-$distance links $($such as across a country$).$ ii$.$ The Maximum Transmission Unit $($MTU$)$ of Ethernet is dictated by the buffer size of the link$-$layer endpoints. iii. Ethernet adaptors send frames as soon as they have any available data. iv$.$ The Ethernet spanning tree may take a longer path through a network than that which would be calculated by a link$-$state algorithm $($assuming both have converged$).$ v$.$ The Ethernet spanning tree protocol prevents Ethernet forwarding from ever encountering a loop$\mathrm{.}3$