I choose option (3).
Walking toward the target is always the best way to go. Often, it is not possible to walk toward the target throughout the approach, such as in Ian's case. In cases such as this, and indeed in most cases, the teaching is that bowlers should walk straight on, and only changing direction to angle inward/outward toward the target at the final 2 steps.
![Smile Smile](/images/emoticons/classic/icon_smile.gif)
This way, the first few steps avoid the inconsistency of drift and take up a small area, while from the 2nd last step onward, the bowler's momentum is positioned to thrust toward the target, hence relieving the arm of a lot of stress and tension, which is necessary for a clean release.
Make no mistake about this.
![Neutral Neutral](/images/emoticons/classic/icon_neutral.gif)
I only sounds easy - even the pros find this a very advanced technique to master. And this is also the reason why a lot of amatuers (like us) cannot play the deep inside line properly. Most people simply stand deep in, and try to "swing" the ball outwards. This, as they have found out, is next to impossible to execute while at the same time keeping the same amount of power and push as their regular, tighter release.
![Crying or Very sad Crying or Very sad](/images/emoticons/classic/icon_cry.gif)