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Consider the following features:

I. Ampulla of Lorenzini

II. Operculum or gill cover

III. Ureotelism

IV. Viviparity

V. Swim bladder

VI. Lateral line system

The features that can be attributed to cartilaginous fishes are:

(1) I, III and IV only

(2) II, V and VI only

(3) I, II, III and IV

(4) All