For each scenario, identify the pricing strategy pursued.

a$.$

MatchingBirds.com offers a free month when signing up for a one$-$year subscription to its online dating service.

MatchingBirds.com is engaged in $$

b$.$ FlyingText prevents its invisible fonts feature from being transferred to another word processor system. Flying text is engaged in $$

c$.$ AEGames releases its Futbol online game platform for an initial price of $$49\mathrm{.}99$ but sells the game for $$24\mathrm{.}99$ at the end of the year. AEGames is engaged in $$

d$.$ FastFox provides a free subscription to its Music$4$Run audio streaming platform when customers purchase its latest activity tracker wearable. FastFox is engaged in $$

e$.$ iCordLess phones obstruct its users from moving their contact list, music, or podcasts to other smartphones.

iCordless is engaged in $$