Many networking terms are abbreviations built from words that describe exactly what the underlying technology does. Breaking the abbreviation into its component words, and checking that the resulting phrase matches a real, standard protocol, is the safest way to answer this kind of question.
TCP stands for Transmission Control Protocol. It is a core internet protocol that governs how data is broken into packets, sent across a network, and reassembled correctly and in order at the destination, with error-checking to make sure no data is lost or corrupted along the way.
"Transmission Communication Protocol" and "Transformation Control Protocol" swap in words that sound similar but are not the accepted expansion of the letters in this abbreviation, and "Transmission Central Pass" does not correspond to any recognised networking term at all.
TCP is frequently mentioned alongside IP as "TCP/IP", the foundational protocol suite of the Internet; remembering that pairing helps confirm "Control" is the correct middle word.
