Step 1: Concept
A ‘mudra' in Carnatic music compositions refers to a signature phrase woven into the lyrics (Sahitya) by the composer to signify ownership, devotion, or structural design. An Vaggeyakara's personal signature is called an Ankita Mudra.
Step 2: Tracking the Mudras
- Patnam Subramanya Iyer used the mudra Venkatesa or variations of it.
- Annamacharya signed his padams dedicated to Lord Venkateswara using the ankita Venkatesa.
- Mysore Vasudevachar utilized the signature phrase Vasudeva.
- Maharaja Swati Tirunal of Travancore was a deep devotee of Lord Padmanabha (the reclining form of Vishnu). He used various synonyms of the lotus-navelled Lord, such as Padmanabha, Kamalanabha, Jalajanabha, and Pankajanabha, across his numerous kritis, padams, and tillanas.
Step 3: Conclusion
"Kamalanabha" is an exclusive synonym signature used by Swati Tirunal, aligning with option (B).
Final Answer: (B)