pennyless

a receiver swaption = call option

if you have a callable bond and you want to remove the call, you want to remove the call option and thus "remove" the receiver swaption. or sell it. so to remove the call you sell the receiver option

if you have a noncallable bond and want to add a synthetic call, you buy the receiver option.

it was not specifically mentioned in the LOS so there is no way they can ask us to calculate this shiz unless they wanna tick me off. i imagine if you memorize this concept you should be able to get the 3 choice mc question down. hopefully lol