Answer only, no need explanation

In which case will locational arbitrage most likely be infeasible?

$5$

a$.$ One bank's ask price for a currency is greater than another bank's bid price for the currency.

b$.$ One bank's bid price for a currency in one location is greater than another bank's ask price for the currency in another location.

c$.$ One bank's bid price for a currency in one location is greater than another bank's ask price for the currency in the same location.

d$.$ One bank's bid price for a currency is less than another bank's bid price for the currency.

e$.$ No answer