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(Python) In the Unified Modeling Language, which symbol indicates that objects of the Music class contain...

(Python) In the Unified Modeling Language, which symbol indicates that objects of the Music class contain (has-a) of the Note class?

Group of answer choices

1. Music

|

|

/ \

\ /

Note

2. Music

/ \

|

|

Note

3. Music

/ \

\ /

|

|

Note

4. Music

|

|

\ /

Note

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Homework Answers

Answer #1

In UML, we can indicate different types of relations specified with different symbols. Following is the list -

Now, both the last 2 diamond shaped arrows are for has-a (contains) relationship where the 1st one denotes may or may not contain another class while the 2nd one denotes the compulsory containment of one class in another.

Option 1

Music   Note

Means that note has (or contains) music. ==> Incorrect

Option 2 and 4 basically denotes association ==> Incorrect

Option 3

Music Note

Means that music class has (or contains) note class ==> Correct option

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