Interpret each of the following citations by selecting the correct answer from each dropdown:

a$.$ Temp.Reg. $1\mathrm{.}720-6$T$.$

Type of regulation

Related code section

Regulation section number

Temporary

b$.$ Rev.Rul. $2012-4,2012-38$ I.R$.$B$.641.$

Revenue ruling number

Page

Issue week

C$.$ Ltr$.$Rul. $20034115.$

Letter ruling

Issue week

Year