Concept:
Every alternate letter starting from B is written in small letters:
\[
A({Cap}),\ B({small}),\ C({Cap}),\ D({small}), ......
\]
Step 1: Find the 3rd day from Tuesday.
\[
{Tuesday} \rightarrow {Wednesday} (1) \rightarrow {Thursday} (2) \rightarrow {Friday} (3)
\]
So, the required day is Friday.
Step 2: Apply coding rule.
Positions:
\[
F(6)\rightarrow {small},\
R(18)\rightarrow {small},\
I(9)\rightarrow {Cap},\
D(4)\rightarrow {small},\
A(1)\rightarrow {Cap},\
Y(25)\rightarrow {Cap}
\]
So coded form:
\[
{frIdAY}
\]
Hence, the correct answer is frIdAY.