Answer : 3. "Eighth"
Explanation :

Recently, JIMEX Exercise-24 is being held in Yokosuka, Japan. This is the eighth edition of JIMEX, which started in 2012. This exercise includes both harbor and sea phase exercises. Indian Navy's indigenous stealth frigate INS Shivalik is participating in this bilateral maritime exercise. On the other hand, guided missile destroyer JS Yugiri is participating from Japan.