Which of the following is an example of triangular arbitrage initiation?

Group of answer choices

converting funds to a foreign currency and investing the funds overseas

buying a currency at one bank's ask and selling at another bank's bid, which is higher than the former bank's ask

buying Singapore dollars from a bank $($quoted at $$\mathrm{.}55)$ that has quoted the South African rand$/$Singapore dollar exchange rate at SAR$3\mathrm{.}00$ when the spot rate for the rand is $$\mathrm{.}20$

buying Singapore dollars from a bank $($quoted at $$\mathrm{.}55)$ that has quoted the South African rand $($SAR$)/$Singapore dollar $($S$$)$ exchange rate at SAR$2\mathrm{.}50$ when the spot rate for the rand is $$\mathrm{.}20$