Meaning of "Registered post"

[Josee]

Test No. incompl/inter-16 "Letter Writing", question 8

Since that package contains valuable items, you must send it by ......... post.

(a) required
(b) resigned
(c) registered
(d) repeated

Test No. incompl/inter-16 "Letter Writing", answer 8

Since that package contains valuable items, you must send it by registered post.

Correct answer: (c) registered

Your answer was: incorrect
Since that package contains valuable items, you must send it by resigned post.
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what is registered post?
Is it the one that requires the receiver to sign before he/she gets his/her package?

Jose

[Alan]

You're absolutely right.
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English as a Second Language
You can read my ESL story Phrasal Verbs/look