Which of the following is an inversion of a double slider crank chain?

Which of the following is an inversion of a double slider crank chain? Correct Answer All of the mentioned

A double slider crank chain consists of two sliding pairs and two turning pairs. The inversions of a double slider crank chain are as follows: a) elliptical trammel b) scotch yoke mechanism c) oldham’s coupling.
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The following is the inversion of slider crank chain mechanism
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank, $$\theta $$ = Angle of inclination of crank with the line of stroke and n = Ratio of the length of connecting rod to radius of crank)
The velocity of piston in a reciprocating steam engine is given by (where $$\omega $$ = Angular velocity of crank, r = Radius of crank pin circle, $$\theta $$ = Angle turned by crank from inner dead center and n = Ratio of length of connecting rod to the radius of crank)
Any point on a link connecting double slider crank chain will trace a
A point on a link connecting double slider crank chain traces a